/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
/* Copyright 2012 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*jshint globalstrict: false */
/* globals PDFJS */

// Initializing PDFJS global object (if still undefined)
if (typeof PDFJS === 'undefined') {
    (typeof window !== 'undefined' ? window : this).PDFJS = {};
}

PDFJS.version = '1.1.9';
PDFJS.build = 'c5eb34e';

(function pdfjsWrapper() {
    // Use strict in our context only - users might not want it
    'use strict';

    /* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
    /* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
    /* Copyright 2012 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
    /* globals Cmd, ColorSpace, Dict, MozBlobBuilder, Name, PDFJS, Ref, URL,
           Promise */

    'use strict';

    var globalScope = (typeof window === 'undefined') ? this : window;

    var isWorker = (typeof window === 'undefined');

    var FONT_IDENTITY_MATRIX = [0.001, 0, 0, 0.001, 0, 0];

    var TextRenderingMode = {
        FILL: 0,
        STROKE: 1,
        FILL_STROKE: 2,
        INVISIBLE: 3,
        FILL_ADD_TO_PATH: 4,
        STROKE_ADD_TO_PATH: 5,
        FILL_STROKE_ADD_TO_PATH: 6,
        ADD_TO_PATH: 7,
        FILL_STROKE_MASK: 3,
        ADD_TO_PATH_FLAG: 4
    };

    var ImageKind = {
        GRAYSCALE_1BPP: 1,
        RGB_24BPP: 2,
        RGBA_32BPP: 3
    };

    var AnnotationType = {
        WIDGET: 1,
        TEXT: 2,
        LINK: 3
    };

    var StreamType = {
        UNKNOWN: 0,
        FLATE: 1,
        LZW: 2,
        DCT: 3,
        JPX: 4,
        JBIG: 5,
        A85: 6,
        AHX: 7,
        CCF: 8,
        RL: 9
    };

    var FontType = {
        UNKNOWN: 0,
        TYPE1: 1,
        TYPE1C: 2,
        CIDFONTTYPE0: 3,
        CIDFONTTYPE0C: 4,
        TRUETYPE: 5,
        CIDFONTTYPE2: 6,
        TYPE3: 7,
        OPENTYPE: 8,
        TYPE0: 9,
        MMTYPE1: 10
    };

// The global PDFJS object exposes the API
// In production, it will be declared outside a global wrapper
// In development, it will be declared here
    if (!globalScope.PDFJS) {
        globalScope.PDFJS = {};
    }

    globalScope.PDFJS.pdfBug = false;

    PDFJS.VERBOSITY_LEVELS = {
        errors: 0,
        warnings: 1,
        infos: 5
    };

// All the possible operations for an operator list.
    var OPS = PDFJS.OPS = {
        // Intentionally start from 1 so it is easy to spot bad operators that will be
        // 0's.
        dependency: 1,
        setLineWidth: 2,
        setLineCap: 3,
        setLineJoin: 4,
        setMiterLimit: 5,
        setDash: 6,
        setRenderingIntent: 7,
        setFlatness: 8,
        setGState: 9,
        save: 10,
        restore: 11,
        transform: 12,
        moveTo: 13,
        lineTo: 14,
        curveTo: 15,
        curveTo2: 16,
        curveTo3: 17,
        closePath: 18,
        rectangle: 19,
        stroke: 20,
        closeStroke: 21,
        fill: 22,
        eoFill: 23,
        fillStroke: 24,
        eoFillStroke: 25,
        closeFillStroke: 26,
        closeEOFillStroke: 27,
        endPath: 28,
        clip: 29,
        eoClip: 30,
        beginText: 31,
        endText: 32,
        setCharSpacing: 33,
        setWordSpacing: 34,
        setHScale: 35,
        setLeading: 36,
        setFont: 37,
        setTextRenderingMode: 38,
        setTextRise: 39,
        moveText: 40,
        setLeadingMoveText: 41,
        setTextMatrix: 42,
        nextLine: 43,
        showText: 44,
        showSpacedText: 45,
        nextLineShowText: 46,
        nextLineSetSpacingShowText: 47,
        setCharWidth: 48,
        setCharWidthAndBounds: 49,
        setStrokeColorSpace: 50,
        setFillColorSpace: 51,
        setStrokeColor: 52,
        setStrokeColorN: 53,
        setFillColor: 54,
        setFillColorN: 55,
        setStrokeGray: 56,
        setFillGray: 57,
        setStrokeRGBColor: 58,
        setFillRGBColor: 59,
        setStrokeCMYKColor: 60,
        setFillCMYKColor: 61,
        shadingFill: 62,
        beginInlineImage: 63,
        beginImageData: 64,
        endInlineImage: 65,
        paintXObject: 66,
        markPoint: 67,
        markPointProps: 68,
        beginMarkedContent: 69,
        beginMarkedContentProps: 70,
        endMarkedContent: 71,
        beginCompat: 72,
        endCompat: 73,
        paintFormXObjectBegin: 74,
        paintFormXObjectEnd: 75,
        beginGroup: 76,
        endGroup: 77,
        beginAnnotations: 78,
        endAnnotations: 79,
        beginAnnotation: 80,
        endAnnotation: 81,
        paintJpegXObject: 82,
        paintImageMaskXObject: 83,
        paintImageMaskXObjectGroup: 84,
        paintImageXObject: 85,
        paintInlineImageXObject: 86,
        paintInlineImageXObjectGroup: 87,
        paintImageXObjectRepeat: 88,
        paintImageMaskXObjectRepeat: 89,
        paintSolidColorImageMask: 90,
        constructPath: 91
    };

// A notice for devs. These are good for things that are helpful to devs, such
// as warning that Workers were disabled, which is important to devs but not
// end users.
    function info(msg) {
        if (PDFJS.verbosity >= PDFJS.VERBOSITY_LEVELS.infos) {
            console.log('Info: ' + msg);
        }
    }

// Non-fatal warnings.
    function warn(msg) {
        if (PDFJS.verbosity >= PDFJS.VERBOSITY_LEVELS.warnings) {
            console.log('Warning: ' + msg);
        }
    }

// Fatal errors that should trigger the fallback UI and halt execution by
// throwing an exception.
    function error(msg) {
        // If multiple arguments were passed, pass them all to the log function.
        if (arguments.length > 1) {
            var logArguments = ['Error:'];
            logArguments.push.apply(logArguments, arguments);
            console.log.apply(console, logArguments);
            // Join the arguments into a single string for the lines below.
            msg = [].join.call(arguments, ' ');
        } else {
            console.log('Error: ' + msg);
        }
        console.log(backtrace());
        UnsupportedManager.notify(UNSUPPORTED_FEATURES.unknown);
        throw new Error(msg);
    }

    function backtrace() {
        try {
            throw new Error();
        } catch (e) {
            return e.stack ? e.stack.split('\n').slice(2).join('\n') : '';
        }
    }

    function assert(cond, msg) {
        if (!cond) {
            error(msg);
        }
    }

    var UNSUPPORTED_FEATURES = PDFJS.UNSUPPORTED_FEATURES = {
        unknown: 'unknown',
        forms: 'forms',
        javaScript: 'javaScript',
        smask: 'smask',
        shadingPattern: 'shadingPattern',
        font: 'font'
    };

    var UnsupportedManager = PDFJS.UnsupportedManager =
        (function UnsupportedManagerClosure() {
            var listeners = [];
            return {
                listen: function (cb) {
                    listeners.push(cb);
                },
                notify: function (featureId) {
                    warn('Unsupported feature "' + featureId + '"');
                    for (var i = 0, ii = listeners.length; i < ii; i++) {
                        listeners[i](featureId);
                    }
                }
            };
        })();

// Combines two URLs. The baseUrl shall be absolute URL. If the url is an
// absolute URL, it will be returned as is.
    function combineUrl(baseUrl, url) {
        if (!url) {
            return baseUrl;
        }
        if (/^[a-z][a-z0-9+\-.]*:/i.test(url)) {
            return url;
        }
        var i;
        if (url.charAt(0) === '/') {
            // absolute path
            i = baseUrl.indexOf('://');
            if (url.charAt(1) === '/') {
                ++i;
            } else {
                i = baseUrl.indexOf('/', i + 3);
            }
            return baseUrl.substring(0, i) + url;
        } else {
            // relative path
            var pathLength = baseUrl.length;
            i = baseUrl.lastIndexOf('#');
            pathLength = i >= 0 ? i : pathLength;
            i = baseUrl.lastIndexOf('?', pathLength);
            pathLength = i >= 0 ? i : pathLength;
            var prefixLength = baseUrl.lastIndexOf('/', pathLength);
            return baseUrl.substring(0, prefixLength + 1) + url;
        }
    }

// Validates if URL is safe and allowed, e.g. to avoid XSS.
    function isValidUrl(url, allowRelative) {
        if (!url) {
            return false;
        }
        // RFC 3986 (http://tools.ietf.org/html/rfc3986#section-3.1)
        // scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
        var protocol = /^[a-z][a-z0-9+\-.]*(?=:)/i.exec(url);
        if (!protocol) {
            return allowRelative;
        }
        protocol = protocol[0].toLowerCase();
        switch (protocol) {
            case 'http':
            case 'https':
            case 'ftp':
            case 'mailto':
            case 'tel':
                return true;
            default:
                return false;
        }
    }
    PDFJS.isValidUrl = isValidUrl;

    function shadow(obj, prop, value) {
        Object.defineProperty(obj, prop, { value: value,
            enumerable: true,
            configurable: true,
            writable: false });
        return value;
    }
    PDFJS.shadow = shadow;

    var PasswordResponses = PDFJS.PasswordResponses = {
        NEED_PASSWORD: 1,
        INCORRECT_PASSWORD: 2
    };

    var PasswordException = (function PasswordExceptionClosure() {
        function PasswordException(msg, code) {
            this.name = 'PasswordException';
            this.message = msg;
            this.code = code;
        }

        PasswordException.prototype = new Error();
        PasswordException.constructor = PasswordException;

        return PasswordException;
    })();
    PDFJS.PasswordException = PasswordException;

    var UnknownErrorException = (function UnknownErrorExceptionClosure() {
        function UnknownErrorException(msg, details) {
            this.name = 'UnknownErrorException';
            this.message = msg;
            this.details = details;
        }

        UnknownErrorException.prototype = new Error();
        UnknownErrorException.constructor = UnknownErrorException;

        return UnknownErrorException;
    })();
    PDFJS.UnknownErrorException = UnknownErrorException;

    var InvalidPDFException = (function InvalidPDFExceptionClosure() {
        function InvalidPDFException(msg) {
            this.name = 'InvalidPDFException';
            this.message = msg;
        }

        InvalidPDFException.prototype = new Error();
        InvalidPDFException.constructor = InvalidPDFException;

        return InvalidPDFException;
    })();
    PDFJS.InvalidPDFException = InvalidPDFException;

    var MissingPDFException = (function MissingPDFExceptionClosure() {
        function MissingPDFException(msg) {
            this.name = 'MissingPDFException';
            this.message = msg;
        }

        MissingPDFException.prototype = new Error();
        MissingPDFException.constructor = MissingPDFException;

        return MissingPDFException;
    })();
    PDFJS.MissingPDFException = MissingPDFException;

    var UnexpectedResponseException =
        (function UnexpectedResponseExceptionClosure() {
            function UnexpectedResponseException(msg, status) {
                this.name = 'UnexpectedResponseException';
                this.message = msg;
                this.status = status;
            }

            UnexpectedResponseException.prototype = new Error();
            UnexpectedResponseException.constructor = UnexpectedResponseException;

            return UnexpectedResponseException;
        })();
    PDFJS.UnexpectedResponseException = UnexpectedResponseException;

    var NotImplementedException = (function NotImplementedExceptionClosure() {
        function NotImplementedException(msg) {
            this.message = msg;
        }

        NotImplementedException.prototype = new Error();
        NotImplementedException.prototype.name = 'NotImplementedException';
        NotImplementedException.constructor = NotImplementedException;

        return NotImplementedException;
    })();

    var MissingDataException = (function MissingDataExceptionClosure() {
        function MissingDataException(begin, end) {
            this.begin = begin;
            this.end = end;
            this.message = 'Missing data [' + begin + ', ' + end + ')';
        }

        MissingDataException.prototype = new Error();
        MissingDataException.prototype.name = 'MissingDataException';
        MissingDataException.constructor = MissingDataException;

        return MissingDataException;
    })();

    var XRefParseException = (function XRefParseExceptionClosure() {
        function XRefParseException(msg) {
            this.message = msg;
        }

        XRefParseException.prototype = new Error();
        XRefParseException.prototype.name = 'XRefParseException';
        XRefParseException.constructor = XRefParseException;

        return XRefParseException;
    })();


    function bytesToString(bytes) {
        assert(bytes !== null && typeof bytes === 'object' &&
            bytes.length !== undefined, 'Invalid argument for bytesToString');
        var length = bytes.length;
        var MAX_ARGUMENT_COUNT = 8192;
        if (length < MAX_ARGUMENT_COUNT) {
            return String.fromCharCode.apply(null, bytes);
        }
        var strBuf = [];
        for (var i = 0; i < length; i += MAX_ARGUMENT_COUNT) {
            var chunkEnd = Math.min(i + MAX_ARGUMENT_COUNT, length);
            var chunk = bytes.subarray(i, chunkEnd);
            strBuf.push(String.fromCharCode.apply(null, chunk));
        }
        return strBuf.join('');
    }

    function stringToBytes(str) {
        assert(typeof str === 'string', 'Invalid argument for stringToBytes');
        var length = str.length;
        var bytes = new Uint8Array(length);
        for (var i = 0; i < length; ++i) {
            bytes[i] = str.charCodeAt(i) & 0xFF;
        }
        return bytes;
    }

    function string32(value) {
        return String.fromCharCode((value >> 24) & 0xff, (value >> 16) & 0xff,
            (value >> 8) & 0xff, value & 0xff);
    }

    function log2(x) {
        var n = 1, i = 0;
        while (x > n) {
            n <<= 1;
            i++;
        }
        return i;
    }

    function readInt8(data, start) {
        return (data[start] << 24) >> 24;
    }

    function readUint16(data, offset) {
        return (data[offset] << 8) | data[offset + 1];
    }

    function readUint32(data, offset) {
        return ((data[offset] << 24) | (data[offset + 1] << 16) |
            (data[offset + 2] << 8) | data[offset + 3]) >>> 0;
    }

// Lazy test the endianness of the platform
// NOTE: This will be 'true' for simulated TypedArrays
    function isLittleEndian() {
        var buffer8 = new Uint8Array(2);
        buffer8[0] = 1;
        var buffer16 = new Uint16Array(buffer8.buffer);
        return (buffer16[0] === 1);
    }

    Object.defineProperty(PDFJS, 'isLittleEndian', {
        configurable: true,
        get: function PDFJS_isLittleEndian() {
            return shadow(PDFJS, 'isLittleEndian', isLittleEndian());
        }
    });

    // Lazy test if the userAgant support CanvasTypedArrays
    function hasCanvasTypedArrays() {
        var canvas = document.createElement('canvas');
        canvas.width = canvas.height = 1;
        var ctx = canvas.getContext('2d');
        var imageData = ctx.createImageData(1, 1);
        return (typeof imageData.data.buffer !== 'undefined');
    }

    Object.defineProperty(PDFJS, 'hasCanvasTypedArrays', {
        configurable: true,
        get: function PDFJS_hasCanvasTypedArrays() {
            return shadow(PDFJS, 'hasCanvasTypedArrays', hasCanvasTypedArrays());
        }
    });

    var Uint32ArrayView = (function Uint32ArrayViewClosure() {

        function Uint32ArrayView(buffer, length) {
            this.buffer = buffer;
            this.byteLength = buffer.length;
            this.length = length === undefined ? (this.byteLength >> 2) : length;
            ensureUint32ArrayViewProps(this.length);
        }
        Uint32ArrayView.prototype = Object.create(null);

        var uint32ArrayViewSetters = 0;
        function createUint32ArrayProp(index) {
            return {
                get: function () {
                    var buffer = this.buffer, offset = index << 2;
                    return (buffer[offset] | (buffer[offset + 1] << 8) |
                        (buffer[offset + 2] << 16) | (buffer[offset + 3] << 24)) >>> 0;
                },
                set: function (value) {
                    var buffer = this.buffer, offset = index << 2;
                    buffer[offset] = value & 255;
                    buffer[offset + 1] = (value >> 8) & 255;
                    buffer[offset + 2] = (value >> 16) & 255;
                    buffer[offset + 3] = (value >>> 24) & 255;
                }
            };
        }

        function ensureUint32ArrayViewProps(length) {
            while (uint32ArrayViewSetters < length) {
                Object.defineProperty(Uint32ArrayView.prototype,
                    uint32ArrayViewSetters,
                    createUint32ArrayProp(uint32ArrayViewSetters));
                uint32ArrayViewSetters++;
            }
        }

        return Uint32ArrayView;
    })();

    var IDENTITY_MATRIX = [1, 0, 0, 1, 0, 0];

    var Util = PDFJS.Util = (function UtilClosure() {
        function Util() {}

        var rgbBuf = ['rgb(', 0, ',', 0, ',', 0, ')'];

        // makeCssRgb() can be called thousands of times. Using |rgbBuf| avoids
        // creating many intermediate strings.
        Util.makeCssRgb = function Util_makeCssRgb(r, g, b) {
            rgbBuf[1] = r;
            rgbBuf[3] = g;
            rgbBuf[5] = b;
            return rgbBuf.join('');
        };

        // Concatenates two transformation matrices together and returns the result.
        Util.transform = function Util_transform(m1, m2) {
            return [
                m1[0] * m2[0] + m1[2] * m2[1],
                m1[1] * m2[0] + m1[3] * m2[1],
                m1[0] * m2[2] + m1[2] * m2[3],
                m1[1] * m2[2] + m1[3] * m2[3],
                m1[0] * m2[4] + m1[2] * m2[5] + m1[4],
                m1[1] * m2[4] + m1[3] * m2[5] + m1[5]
            ];
        };

        // For 2d affine transforms
        Util.applyTransform = function Util_applyTransform(p, m) {
            var xt = p[0] * m[0] + p[1] * m[2] + m[4];
            var yt = p[0] * m[1] + p[1] * m[3] + m[5];
            return [xt, yt];
        };

        Util.applyInverseTransform = function Util_applyInverseTransform(p, m) {
            var d = m[0] * m[3] - m[1] * m[2];
            var xt = (p[0] * m[3] - p[1] * m[2] + m[2] * m[5] - m[4] * m[3]) / d;
            var yt = (-p[0] * m[1] + p[1] * m[0] + m[4] * m[1] - m[5] * m[0]) / d;
            return [xt, yt];
        };

        // Applies the transform to the rectangle and finds the minimum axially
        // aligned bounding box.
        Util.getAxialAlignedBoundingBox =
            function Util_getAxialAlignedBoundingBox(r, m) {

                var p1 = Util.applyTransform(r, m);
                var p2 = Util.applyTransform(r.slice(2, 4), m);
                var p3 = Util.applyTransform([r[0], r[3]], m);
                var p4 = Util.applyTransform([r[2], r[1]], m);
                return [
                    Math.min(p1[0], p2[0], p3[0], p4[0]),
                    Math.min(p1[1], p2[1], p3[1], p4[1]),
                    Math.max(p1[0], p2[0], p3[0], p4[0]),
                    Math.max(p1[1], p2[1], p3[1], p4[1])
                ];
            };

        Util.inverseTransform = function Util_inverseTransform(m) {
            var d = m[0] * m[3] - m[1] * m[2];
            return [m[3] / d, -m[1] / d, -m[2] / d, m[0] / d,
                (m[2] * m[5] - m[4] * m[3]) / d, (m[4] * m[1] - m[5] * m[0]) / d];
        };

        // Apply a generic 3d matrix M on a 3-vector v:
        //   | a b c |   | X |
        //   | d e f | x | Y |
        //   | g h i |   | Z |
        // M is assumed to be serialized as [a,b,c,d,e,f,g,h,i],
        // with v as [X,Y,Z]
        Util.apply3dTransform = function Util_apply3dTransform(m, v) {
            return [
                m[0] * v[0] + m[1] * v[1] + m[2] * v[2],
                m[3] * v[0] + m[4] * v[1] + m[5] * v[2],
                m[6] * v[0] + m[7] * v[1] + m[8] * v[2]
            ];
        };

        // This calculation uses Singular Value Decomposition.
        // The SVD can be represented with formula A = USV. We are interested in the
        // matrix S here because it represents the scale values.
        Util.singularValueDecompose2dScale =
            function Util_singularValueDecompose2dScale(m) {

                var transpose = [m[0], m[2], m[1], m[3]];

                // Multiply matrix m with its transpose.
                var a = m[0] * transpose[0] + m[1] * transpose[2];
                var b = m[0] * transpose[1] + m[1] * transpose[3];
                var c = m[2] * transpose[0] + m[3] * transpose[2];
                var d = m[2] * transpose[1] + m[3] * transpose[3];

                // Solve the second degree polynomial to get roots.
                var first = (a + d) / 2;
                var second = Math.sqrt((a + d) * (a + d) - 4 * (a * d - c * b)) / 2;
                var sx = first + second || 1;
                var sy = first - second || 1;

                // Scale values are the square roots of the eigenvalues.
                return [Math.sqrt(sx), Math.sqrt(sy)];
            };

        // Normalize rectangle rect=[x1, y1, x2, y2] so that (x1,y1) < (x2,y2)
        // For coordinate systems whose origin lies in the bottom-left, this
        // means normalization to (BL,TR) ordering. For systems with origin in the
        // top-left, this means (TL,BR) ordering.
        Util.normalizeRect = function Util_normalizeRect(rect) {
            var r = rect.slice(0); // clone rect
            if (rect[0] > rect[2]) {
                r[0] = rect[2];
                r[2] = rect[0];
            }
            if (rect[1] > rect[3]) {
                r[1] = rect[3];
                r[3] = rect[1];
            }
            return r;
        };

        // Returns a rectangle [x1, y1, x2, y2] corresponding to the
        // intersection of rect1 and rect2. If no intersection, returns 'false'
        // The rectangle coordinates of rect1, rect2 should be [x1, y1, x2, y2]
        Util.intersect = function Util_intersect(rect1, rect2) {
            function compare(a, b) {
                return a - b;
            }

            // Order points along the axes
            var orderedX = [rect1[0], rect1[2], rect2[0], rect2[2]].sort(compare),
                orderedY = [rect1[1], rect1[3], rect2[1], rect2[3]].sort(compare),
                result = [];

            rect1 = Util.normalizeRect(rect1);
            rect2 = Util.normalizeRect(rect2);

            // X: first and second points belong to different rectangles?
            if ((orderedX[0] === rect1[0] && orderedX[1] === rect2[0]) ||
                (orderedX[0] === rect2[0] && orderedX[1] === rect1[0])) {
                // Intersection must be between second and third points
                result[0] = orderedX[1];
                result[2] = orderedX[2];
            } else {
                return false;
            }

            // Y: first and second points belong to different rectangles?
            if ((orderedY[0] === rect1[1] && orderedY[1] === rect2[1]) ||
                (orderedY[0] === rect2[1] && orderedY[1] === rect1[1])) {
                // Intersection must be between second and third points
                result[1] = orderedY[1];
                result[3] = orderedY[2];
            } else {
                return false;
            }

            return result;
        };

        Util.sign = function Util_sign(num) {
            return num < 0 ? -1 : 1;
        };

        Util.appendToArray = function Util_appendToArray(arr1, arr2) {
            Array.prototype.push.apply(arr1, arr2);
        };

        Util.prependToArray = function Util_prependToArray(arr1, arr2) {
            Array.prototype.unshift.apply(arr1, arr2);
        };

        Util.extendObj = function extendObj(obj1, obj2) {
            for (var key in obj2) {
                obj1[key] = obj2[key];
            }
        };

        Util.getInheritableProperty = function Util_getInheritableProperty(dict,
                                                                           name) {
            while (dict && !dict.has(name)) {
                dict = dict.get('Parent');
            }
            if (!dict) {
                return null;
            }
            return dict.get(name);
        };

        Util.inherit = function Util_inherit(sub, base, prototype) {
            sub.prototype = Object.create(base.prototype);
            sub.prototype.constructor = sub;
            for (var prop in prototype) {
                sub.prototype[prop] = prototype[prop];
            }
        };

        Util.loadScript = function Util_loadScript(src, callback) {
            var script = document.createElement('script');
            var loaded = false;
            script.setAttribute('src', src);
            if (callback) {
                script.onload = function() {
                    if (!loaded) {
                        callback();
                    }
                    loaded = true;
                };
            }
            document.getElementsByTagName('head')[0].appendChild(script);
        };

        return Util;
    })();

    /**
     * PDF page viewport created based on scale, rotation and offset.
     * @class
     * @alias PDFJS.PageViewport
     */
    var PageViewport = PDFJS.PageViewport = (function PageViewportClosure() {
        /**
         * @constructor
         * @private
         * @param viewBox {Array} xMin, yMin, xMax and yMax coordinates.
         * @param scale {number} scale of the viewport.
         * @param rotation {number} rotations of the viewport in degrees.
         * @param offsetX {number} offset X
         * @param offsetY {number} offset Y
         * @param dontFlip {boolean} if true, axis Y will not be flipped.
         */
        function PageViewport(viewBox, scale, rotation, offsetX, offsetY, dontFlip) {
            this.viewBox = viewBox;
            this.scale = scale;
            this.rotation = rotation;
            this.offsetX = offsetX;
            this.offsetY = offsetY;

            // creating transform to convert pdf coordinate system to the normal
            // canvas like coordinates taking in account scale and rotation
            var centerX = (viewBox[2] + viewBox[0]) / 2;
            var centerY = (viewBox[3] + viewBox[1]) / 2;
            var rotateA, rotateB, rotateC, rotateD;
            rotation = rotation % 360;
            rotation = rotation < 0 ? rotation + 360 : rotation;
            switch (rotation) {
                case 180:
                    rotateA = -1; rotateB = 0; rotateC = 0; rotateD = 1;
                    break;
                case 90:
                    rotateA = 0; rotateB = 1; rotateC = 1; rotateD = 0;
                    break;
                case 270:
                    rotateA = 0; rotateB = -1; rotateC = -1; rotateD = 0;
                    break;
                //case 0:
                default:
                    rotateA = 1; rotateB = 0; rotateC = 0; rotateD = -1;
                    break;
            }

            if (dontFlip) {
                rotateC = -rotateC; rotateD = -rotateD;
            }

            var offsetCanvasX, offsetCanvasY;
            var width, height;
            if (rotateA === 0) {
                offsetCanvasX = Math.abs(centerY - viewBox[1]) * scale + offsetX;
                offsetCanvasY = Math.abs(centerX - viewBox[0]) * scale + offsetY;
                width = Math.abs(viewBox[3] - viewBox[1]) * scale;
                height = Math.abs(viewBox[2] - viewBox[0]) * scale;
            } else {
                offsetCanvasX = Math.abs(centerX - viewBox[0]) * scale + offsetX;
                offsetCanvasY = Math.abs(centerY - viewBox[1]) * scale + offsetY;
                width = Math.abs(viewBox[2] - viewBox[0]) * scale;
                height = Math.abs(viewBox[3] - viewBox[1]) * scale;
            }
            // creating transform for the following operations:
            // translate(-centerX, -centerY), rotate and flip vertically,
            // scale, and translate(offsetCanvasX, offsetCanvasY)
            this.transform = [
                rotateA * scale,
                rotateB * scale,
                rotateC * scale,
                rotateD * scale,
                offsetCanvasX - rotateA * scale * centerX - rotateC * scale * centerY,
                offsetCanvasY - rotateB * scale * centerX - rotateD * scale * centerY
            ];

            this.width = width;
            this.height = height;
            this.fontScale = scale;
        }
        PageViewport.prototype = /** @lends PDFJS.PageViewport.prototype */ {
            /**
             * Clones viewport with additional properties.
             * @param args {Object} (optional) If specified, may contain the 'scale' or
             * 'rotation' properties to override the corresponding properties in
             * the cloned viewport.
             * @returns {PDFJS.PageViewport} Cloned viewport.
             */
            clone: function PageViewPort_clone(args) {
                args = args || {};
                var scale = 'scale' in args ? args.scale : this.scale;
                var rotation = 'rotation' in args ? args.rotation : this.rotation;
                return new PageViewport(this.viewBox.slice(), scale, rotation,
                    this.offsetX, this.offsetY, args.dontFlip);
            },
            /**
             * Converts PDF point to the viewport coordinates. For examples, useful for
             * converting PDF location into canvas pixel coordinates.
             * @param x {number} X coordinate.
             * @param y {number} Y coordinate.
             * @returns {Object} Object that contains 'x' and 'y' properties of the
             * point in the viewport coordinate space.
             * @see {@link convertToPdfPoint}
             * @see {@link convertToViewportRectangle}
             */
            convertToViewportPoint: function PageViewport_convertToViewportPoint(x, y) {
                return Util.applyTransform([x, y], this.transform);
            },
            /**
             * Converts PDF rectangle to the viewport coordinates.
             * @param rect {Array} xMin, yMin, xMax and yMax coordinates.
             * @returns {Array} Contains corresponding coordinates of the rectangle
             * in the viewport coordinate space.
             * @see {@link convertToViewportPoint}
             */
            convertToViewportRectangle:
                function PageViewport_convertToViewportRectangle(rect) {
                    var tl = Util.applyTransform([rect[0], rect[1]], this.transform);
                    var br = Util.applyTransform([rect[2], rect[3]], this.transform);
                    return [tl[0], tl[1], br[0], br[1]];
                },
            /**
             * Converts viewport coordinates to the PDF location. For examples, useful
             * for converting canvas pixel location into PDF one.
             * @param x {number} X coordinate.
             * @param y {number} Y coordinate.
             * @returns {Object} Object that contains 'x' and 'y' properties of the
             * point in the PDF coordinate space.
             * @see {@link convertToViewportPoint}
             */
            convertToPdfPoint: function PageViewport_convertToPdfPoint(x, y) {
                return Util.applyInverseTransform([x, y], this.transform);
            }
        };
        return PageViewport;
    })();

    var PDFStringTranslateTable = [
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0x2D8, 0x2C7, 0x2C6, 0x2D9, 0x2DD, 0x2DB, 0x2DA, 0x2DC, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x2022, 0x2020, 0x2021, 0x2026, 0x2014,
        0x2013, 0x192, 0x2044, 0x2039, 0x203A, 0x2212, 0x2030, 0x201E, 0x201C,
        0x201D, 0x2018, 0x2019, 0x201A, 0x2122, 0xFB01, 0xFB02, 0x141, 0x152, 0x160,
        0x178, 0x17D, 0x131, 0x142, 0x153, 0x161, 0x17E, 0, 0x20AC
    ];

    function stringToPDFString(str) {
        var i, n = str.length, strBuf = [];
        if (str[0] === '\xFE' && str[1] === '\xFF') {
            // UTF16BE BOM
            for (i = 2; i < n; i += 2) {
                strBuf.push(String.fromCharCode(
                    (str.charCodeAt(i) << 8) | str.charCodeAt(i + 1)));
            }
        } else {
            for (i = 0; i < n; ++i) {
                var code = PDFStringTranslateTable[str.charCodeAt(i)];
                strBuf.push(code ? String.fromCharCode(code) : str.charAt(i));
            }
        }
        return strBuf.join('');
    }

    function stringToUTF8String(str) {
        return decodeURIComponent(escape(str));
    }

    function isEmptyObj(obj) {
        for (var key in obj) {
            return false;
        }
        return true;
    }

    function isBool(v) {
        return typeof v === 'boolean';
    }

    function isInt(v) {
        return typeof v === 'number' && ((v | 0) === v);
    }

    function isNum(v) {
        return typeof v === 'number';
    }

    function isString(v) {
        return typeof v === 'string';
    }

    function isName(v) {
        return v instanceof Name;
    }

    function isCmd(v, cmd) {
        return v instanceof Cmd && (cmd === undefined || v.cmd === cmd);
    }

    function isDict(v, type) {
        if (!(v instanceof Dict)) {
            return false;
        }
        if (!type) {
            return true;
        }
        var dictType = v.get('Type');
        return isName(dictType) && dictType.name === type;
    }

    function isArray(v) {
        return v instanceof Array;
    }

    function isStream(v) {
        return typeof v === 'object' && v !== null && v.getBytes !== undefined;
    }

    function isArrayBuffer(v) {
        return typeof v === 'object' && v !== null && v.byteLength !== undefined;
    }

    function isRef(v) {
        return v instanceof Ref;
    }

    /**
     * Promise Capability object.
     *
     * @typedef {Object} PromiseCapability
     * @property {Promise} promise - A promise object.
     * @property {function} resolve - Fullfills the promise.
     * @property {function} reject - Rejects the promise.
     */

    /**
     * Creates a promise capability object.
     * @alias PDFJS.createPromiseCapability
     *
     * @return {PromiseCapability} A capability object contains:
     * - a Promise, resolve and reject methods.
     */
    function createPromiseCapability() {
        var capability = {};
        capability.promise = new Promise(function (resolve, reject) {
            capability.resolve = resolve;
            capability.reject = reject;
        });
        return capability;
    }

    PDFJS.createPromiseCapability = createPromiseCapability;

    /**
     * Polyfill for Promises:
     * The following promise implementation tries to generally implement the
     * Promise/A+ spec. Some notable differences from other promise libaries are:
     * - There currently isn't a seperate deferred and promise object.
     * - Unhandled rejections eventually show an error if they aren't handled.
     *
     * Based off of the work in:
     * https://bugzilla.mozilla.org/show_bug.cgi?id=810490
     */
    (function PromiseClosure() {
        if (globalScope.Promise) {
            // Promises existing in the DOM/Worker, checking presence of all/resolve
            if (typeof globalScope.Promise.all !== 'function') {
                globalScope.Promise.all = function (iterable) {
                    var count = 0, results = [], resolve, reject;
                    var promise = new globalScope.Promise(function (resolve_, reject_) {
                        resolve = resolve_;
                        reject = reject_;
                    });
                    iterable.forEach(function (p, i) {
                        count++;
                        p.then(function (result) {
                            results[i] = result;
                            count--;
                            if (count === 0) {
                                resolve(results);
                            }
                        }, reject);
                    });
                    if (count === 0) {
                        resolve(results);
                    }
                    return promise;
                };
            }
            if (typeof globalScope.Promise.resolve !== 'function') {
                globalScope.Promise.resolve = function (value) {
                    return new globalScope.Promise(function (resolve) { resolve(value); });
                };
            }
            if (typeof globalScope.Promise.reject !== 'function') {
                globalScope.Promise.reject = function (reason) {
                    return new globalScope.Promise(function (resolve, reject) {
                        reject(reason);
                    });
                };
            }
            if (typeof globalScope.Promise.prototype.catch !== 'function') {
                globalScope.Promise.prototype.catch = function (onReject) {
                    return globalScope.Promise.prototype.then(undefined, onReject);
                };
            }
            return;
        }
        var STATUS_PENDING = 0;
        var STATUS_RESOLVED = 1;
        var STATUS_REJECTED = 2;

        // In an attempt to avoid silent exceptions, unhandled rejections are
        // tracked and if they aren't handled in a certain amount of time an
        // error is logged.
        var REJECTION_TIMEOUT = 500;

        var HandlerManager = {
            handlers: [],
            running: false,
            unhandledRejections: [],
            pendingRejectionCheck: false,

            scheduleHandlers: function scheduleHandlers(promise) {
                if (promise._status === STATUS_PENDING) {
                    return;
                }

                this.handlers = this.handlers.concat(promise._handlers);
                promise._handlers = [];

                if (this.running) {
                    return;
                }
                this.running = true;

                setTimeout(this.runHandlers.bind(this), 0);
            },

            runHandlers: function runHandlers() {
                var RUN_TIMEOUT = 1; // ms
                var timeoutAt = Date.now() + RUN_TIMEOUT;
                while (this.handlers.length > 0) {
                    var handler = this.handlers.shift();

                    var nextStatus = handler.thisPromise._status;
                    var nextValue = handler.thisPromise._value;

                    try {
                        if (nextStatus === STATUS_RESOLVED) {
                            if (typeof handler.onResolve === 'function') {
                                nextValue = handler.onResolve(nextValue);
                            }
                        } else if (typeof handler.onReject === 'function') {
                            nextValue = handler.onReject(nextValue);
                            nextStatus = STATUS_RESOLVED;

                            if (handler.thisPromise._unhandledRejection) {
                                this.removeUnhandeledRejection(handler.thisPromise);
                            }
                        }
                    } catch (ex) {
                        nextStatus = STATUS_REJECTED;
                        nextValue = ex;
                    }

                    handler.nextPromise._updateStatus(nextStatus, nextValue);
                    if (Date.now() >= timeoutAt) {
                        break;
                    }
                }

                if (this.handlers.length > 0) {
                    setTimeout(this.runHandlers.bind(this), 0);
                    return;
                }

                this.running = false;
            },

            addUnhandledRejection: function addUnhandledRejection(promise) {
                this.unhandledRejections.push({
                    promise: promise,
                    time: Date.now()
                });
                this.scheduleRejectionCheck();
            },

            removeUnhandeledRejection: function removeUnhandeledRejection(promise) {
                promise._unhandledRejection = false;
                for (var i = 0; i < this.unhandledRejections.length; i++) {
                    if (this.unhandledRejections[i].promise === promise) {
                        this.unhandledRejections.splice(i);
                        i--;
                    }
                }
            },

            scheduleRejectionCheck: function scheduleRejectionCheck() {
                if (this.pendingRejectionCheck) {
                    return;
                }
                this.pendingRejectionCheck = true;
                setTimeout(function rejectionCheck() {
                    this.pendingRejectionCheck = false;
                    var now = Date.now();
                    for (var i = 0; i < this.unhandledRejections.length; i++) {
                        if (now - this.unhandledRejections[i].time > REJECTION_TIMEOUT) {
                            var unhandled = this.unhandledRejections[i].promise._value;
                            var msg = 'Unhandled rejection: ' + unhandled;
                            if (unhandled.stack) {
                                msg += '\n' + unhandled.stack;
                            }
                            warn(msg);
                            this.unhandledRejections.splice(i);
                            i--;
                        }
                    }
                    if (this.unhandledRejections.length) {
                        this.scheduleRejectionCheck();
                    }
                }.bind(this), REJECTION_TIMEOUT);
            }
        };

        function Promise(resolver) {
            this._status = STATUS_PENDING;
            this._handlers = [];
            try {
                resolver.call(this, this._resolve.bind(this), this._reject.bind(this));
            } catch (e) {
                this._reject(e);
            }
        }
        /**
         * Builds a promise that is resolved when all the passed in promises are
         * resolved.
         * @param {array} array of data and/or promises to wait for.
         * @return {Promise} New dependant promise.
         */
        Promise.all = function Promise_all(promises) {
            var resolveAll, rejectAll;
            var deferred = new Promise(function (resolve, reject) {
                resolveAll = resolve;
                rejectAll = reject;
            });
            var unresolved = promises.length;
            var results = [];
            if (unresolved === 0) {
                resolveAll(results);
                return deferred;
            }
            function reject(reason) {
                if (deferred._status === STATUS_REJECTED) {
                    return;
                }
                results = [];
                rejectAll(reason);
            }
            for (var i = 0, ii = promises.length; i < ii; ++i) {
                var promise = promises[i];
                var resolve = (function(i) {
                    return function(value) {
                        if (deferred._status === STATUS_REJECTED) {
                            return;
                        }
                        results[i] = value;
                        unresolved--;
                        if (unresolved === 0) {
                            resolveAll(results);
                        }
                    };
                })(i);
                if (Promise.isPromise(promise)) {
                    promise.then(resolve, reject);
                } else {
                    resolve(promise);
                }
            }
            return deferred;
        };

        /**
         * Checks if the value is likely a promise (has a 'then' function).
         * @return {boolean} true if value is thenable
         */
        Promise.isPromise = function Promise_isPromise(value) {
            return value && typeof value.then === 'function';
        };

        /**
         * Creates resolved promise
         * @param value resolve value
         * @returns {Promise}
         */
        Promise.resolve = function Promise_resolve(value) {
            return new Promise(function (resolve) { resolve(value); });
        };

        /**
         * Creates rejected promise
         * @param reason rejection value
         * @returns {Promise}
         */
        Promise.reject = function Promise_reject(reason) {
            return new Promise(function (resolve, reject) { reject(reason); });
        };

        Promise.prototype = {
            _status: null,
            _value: null,
            _handlers: null,
            _unhandledRejection: null,

            _updateStatus: function Promise__updateStatus(status, value) {
                if (this._status === STATUS_RESOLVED ||
                    this._status === STATUS_REJECTED) {
                    return;
                }

                if (status === STATUS_RESOLVED &&
                    Promise.isPromise(value)) {
                    value.then(this._updateStatus.bind(this, STATUS_RESOLVED),
                        this._updateStatus.bind(this, STATUS_REJECTED));
                    return;
                }

                this._status = status;
                this._value = value;

                if (status === STATUS_REJECTED && this._handlers.length === 0) {
                    this._unhandledRejection = true;
                    HandlerManager.addUnhandledRejection(this);
                }

                HandlerManager.scheduleHandlers(this);
            },

            _resolve: function Promise_resolve(value) {
                this._updateStatus(STATUS_RESOLVED, value);
            },

            _reject: function Promise_reject(reason) {
                this._updateStatus(STATUS_REJECTED, reason);
            },

            then: function Promise_then(onResolve, onReject) {
                var nextPromise = new Promise(function (resolve, reject) {
                    this.resolve = resolve;
                    this.reject = reject;
                });
                this._handlers.push({
                    thisPromise: this,
                    onResolve: onResolve,
                    onReject: onReject,
                    nextPromise: nextPromise
                });
                HandlerManager.scheduleHandlers(this);
                return nextPromise;
            },

            catch: function Promise_catch(onReject) {
                return this.then(undefined, onReject);
            }
        };

        globalScope.Promise = Promise;
    })();

    var StatTimer = (function StatTimerClosure() {
        function rpad(str, pad, length) {
            while (str.length < length) {
                str += pad;
            }
            return str;
        }
        function StatTimer() {
            this.started = {};
            this.times = [];
            this.enabled = true;
        }
        StatTimer.prototype = {
            time: function StatTimer_time(name) {
                if (!this.enabled) {
                    return;
                }
                if (name in this.started) {
                    warn('Timer is already running for ' + name);
                }
                this.started[name] = Date.now();
            },
            timeEnd: function StatTimer_timeEnd(name) {
                if (!this.enabled) {
                    return;
                }
                if (!(name in this.started)) {
                    warn('Timer has not been started for ' + name);
                }
                this.times.push({
                    'name': name,
                    'start': this.started[name],
                    'end': Date.now()
                });
                // Remove timer from started so it can be called again.
                delete this.started[name];
            },
            toString: function StatTimer_toString() {
                var i, ii;
                var times = this.times;
                var out = '';
                // Find the longest name for padding purposes.
                var longest = 0;
                for (i = 0, ii = times.length; i < ii; ++i) {
                    var name = times[i]['name'];
                    if (name.length > longest) {
                        longest = name.length;
                    }
                }
                for (i = 0, ii = times.length; i < ii; ++i) {
                    var span = times[i];
                    var duration = span.end - span.start;
                    out += rpad(span['name'], ' ', longest) + ' ' + duration + 'ms\n';
                }
                return out;
            }
        };
        return StatTimer;
    })();

    PDFJS.createBlob = function createBlob(data, contentType) {
        if (typeof Blob !== 'undefined') {
            return new Blob([data], { type: contentType });
        }
        // Blob builder is deprecated in FF14 and removed in FF18.
        var bb = new MozBlobBuilder();
        bb.append(data);
        return bb.getBlob(contentType);
    };

    PDFJS.createObjectURL = (function createObjectURLClosure() {
        // Blob/createObjectURL is not available, falling back to data schema.
        var digits =
            'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';

        return function createObjectURL(data, contentType) {
            if (!PDFJS.disableCreateObjectURL &&
                typeof URL !== 'undefined' && URL.createObjectURL) {
                var blob = PDFJS.createBlob(data, contentType);
                return URL.createObjectURL(blob);
            }

            var buffer = 'data:' + contentType + ';base64,';
            for (var i = 0, ii = data.length; i < ii; i += 3) {
                var b1 = data[i] & 0xFF;
                var b2 = data[i + 1] & 0xFF;
                var b3 = data[i + 2] & 0xFF;
                var d1 = b1 >> 2, d2 = ((b1 & 3) << 4) | (b2 >> 4);
                var d3 = i + 1 < ii ? ((b2 & 0xF) << 2) | (b3 >> 6) : 64;
                var d4 = i + 2 < ii ? (b3 & 0x3F) : 64;
                buffer += digits[d1] + digits[d2] + digits[d3] + digits[d4];
            }
            return buffer;
        };
    })();

    function MessageHandler(name, comObj) {
        this.name = name;
        this.comObj = comObj;
        this.callbackIndex = 1;
        this.postMessageTransfers = true;
        var callbacksCapabilities = this.callbacksCapabilities = {};
        var ah = this.actionHandler = {};

        ah['console_log'] = [function ahConsoleLog(data) {
            console.log.apply(console, data);
        }];
        ah['console_error'] = [function ahConsoleError(data) {
            console.error.apply(console, data);
        }];
        ah['_unsupported_feature'] = [function ah_unsupportedFeature(data) {
            UnsupportedManager.notify(data);
        }];

        comObj.onmessage = function messageHandlerComObjOnMessage(event) {
            var data = event.data;
            if (data.isReply) {
                var callbackId = data.callbackId;
                if (data.callbackId in callbacksCapabilities) {
                    var callback = callbacksCapabilities[callbackId];
                    delete callbacksCapabilities[callbackId];
                    if ('error' in data) {
                        callback.reject(data.error);
                    } else {
                        callback.resolve(data.data);
                    }
                } else {
                    error('Cannot resolve callback ' + callbackId);
                }
            } else if (data.action in ah) {
                var action = ah[data.action];
                if (data.callbackId) {
                    Promise.resolve().then(function () {
                        return action[0].call(action[1], data.data);
                    }).then(function (result) {
                        comObj.postMessage({
                            isReply: true,
                            callbackId: data.callbackId,
                            data: result
                        });
                    }, function (reason) {
                        comObj.postMessage({
                            isReply: true,
                            callbackId: data.callbackId,
                            error: reason
                        });
                    });
                } else {
                    action[0].call(action[1], data.data);
                }
            } else {
                error('Unknown action from worker: ' + data.action);
            }
        };
    }

    MessageHandler.prototype = {
        on: function messageHandlerOn(actionName, handler, scope) {
            var ah = this.actionHandler;
            if (ah[actionName]) {
                error('There is already an actionName called "' + actionName + '"');
            }
            ah[actionName] = [handler, scope];
        },
        /**
         * Sends a message to the comObj to invoke the action with the supplied data.
         * @param {String} actionName Action to call.
         * @param {JSON} data JSON data to send.
         * @param {Array} [transfers] Optional list of transfers/ArrayBuffers
         */
        send: function messageHandlerSend(actionName, data, transfers) {
            var message = {
                action: actionName,
                data: data
            };
            this.postMessage(message, transfers);
        },
        /**
         * Sends a message to the comObj to invoke the action with the supplied data.
         * Expects that other side will callback with the response.
         * @param {String} actionName Action to call.
         * @param {JSON} data JSON data to send.
         * @param {Array} [transfers] Optional list of transfers/ArrayBuffers.
         * @returns {Promise} Promise to be resolved with response data.
         */
        sendWithPromise:
            function messageHandlerSendWithPromise(actionName, data, transfers) {
                var callbackId = this.callbackIndex++;
                var message = {
                    action: actionName,
                    data: data,
                    callbackId: callbackId
                };
                var capability = createPromiseCapability();
                this.callbacksCapabilities[callbackId] = capability;
                try {
                    this.postMessage(message, transfers);
                } catch (e) {
                    capability.reject(e);
                }
                return capability.promise;
            },
        /**
         * Sends raw message to the comObj.
         * @private
         * @param message {Object} Raw message.
         * @param transfers List of transfers/ArrayBuffers, or undefined.
         */
        postMessage: function (message, transfers) {
            if (transfers && this.postMessageTransfers) {
                this.comObj.postMessage(message, transfers);
            } else {
                this.comObj.postMessage(message);
            }
        }
    };

    function loadJpegStream(id, imageUrl, objs) {
        var img = new Image();
        img.onload = (function loadJpegStream_onloadClosure() {
            objs.resolve(id, img);
        });
        img.onerror = (function loadJpegStream_onerrorClosure() {
            objs.resolve(id, null);
            warn('Error during JPEG image loading');
        });
        img.src = imageUrl;
    }


    /**
     * The maximum allowed image size in total pixels e.g. width * height. Images
     * above this value will not be drawn. Use -1 for no limit.
     * @var {number}
     */
    PDFJS.maxImageSize = (PDFJS.maxImageSize === undefined ?
        -1 : PDFJS.maxImageSize);

    /**
     * The url of where the predefined Adobe CMaps are located. Include trailing
     * slash.
     * @var {string}
     */
    PDFJS.cMapUrl = (PDFJS.cMapUrl === undefined ? null : PDFJS.cMapUrl);

    /**
     * Specifies if CMaps are binary packed.
     * @var {boolean}
     */
    PDFJS.cMapPacked = PDFJS.cMapPacked === undefined ? false : PDFJS.cMapPacked;

    /**
     * By default fonts are converted to OpenType fonts and loaded via font face
     * rules. If disabled, the font will be rendered using a built in font renderer
     * that constructs the glyphs with primitive path commands.
     * @var {boolean}
     */
    PDFJS.disableFontFace = (PDFJS.disableFontFace === undefined ?
        false : PDFJS.disableFontFace);

    /**
     * Path for image resources, mainly for annotation icons. Include trailing
     * slash.
     * @var {string}
     */
    PDFJS.imageResourcesPath = (PDFJS.imageResourcesPath === undefined ?
        '' : PDFJS.imageResourcesPath);

    /**
     * Disable the web worker and run all code on the main thread. This will happen
     * automatically if the browser doesn't support workers or sending typed arrays
     * to workers.
     * @var {boolean}
     */
    PDFJS.disableWorker = (PDFJS.disableWorker === undefined ?
        false : PDFJS.disableWorker);

    /**
     * Path and filename of the worker file. Required when the worker is enabled in
     * development mode. If unspecified in the production build, the worker will be
     * loaded based on the location of the pdf.js file.
     * @var {string}
     */
    PDFJS.workerSrc = (PDFJS.workerSrc === undefined ? null : PDFJS.workerSrc);

    /**
     * Disable range request loading of PDF files. When enabled and if the server
     * supports partial content requests then the PDF will be fetched in chunks.
     * Enabled (false) by default.
     * @var {boolean}
     */
    PDFJS.disableRange = (PDFJS.disableRange === undefined ?
        false : PDFJS.disableRange);

    /**
     * Disable streaming of PDF file data. By default PDF.js attempts to load PDF
     * in chunks. This default behavior can be disabled.
     * @var {boolean}
     */
    PDFJS.disableStream = (PDFJS.disableStream === undefined ?
        false : PDFJS.disableStream);

    /**
     * Disable pre-fetching of PDF file data. When range requests are enabled PDF.js
     * will automatically keep fetching more data even if it isn't needed to display
     * the current page. This default behavior can be disabled.
     *
     * NOTE: It is also necessary to disable streaming, see above,
     *       in order for disabling of pre-fetching to work correctly.
     * @var {boolean}
     */
    PDFJS.disableAutoFetch = (PDFJS.disableAutoFetch === undefined ?
        false : PDFJS.disableAutoFetch);

    /**
     * Enables special hooks for debugging PDF.js.
     * @var {boolean}
     */
    PDFJS.pdfBug = (PDFJS.pdfBug === undefined ? false : PDFJS.pdfBug);

    /**
     * Enables transfer usage in postMessage for ArrayBuffers.
     * @var {boolean}
     */
    PDFJS.postMessageTransfers = (PDFJS.postMessageTransfers === undefined ?
        true : PDFJS.postMessageTransfers);

    /**
     * Disables URL.createObjectURL usage.
     * @var {boolean}
     */
    PDFJS.disableCreateObjectURL = (PDFJS.disableCreateObjectURL === undefined ?
        false : PDFJS.disableCreateObjectURL);

    /**
     * Disables WebGL usage.
     * @var {boolean}
     */
    PDFJS.disableWebGL = (PDFJS.disableWebGL === undefined ?
        true : PDFJS.disableWebGL);

    /**
     * Disables fullscreen support, and by extension Presentation Mode,
     * in browsers which support the fullscreen API.
     * @var {boolean}
     */
    PDFJS.disableFullscreen = (PDFJS.disableFullscreen === undefined ?
        false : PDFJS.disableFullscreen);

    /**
     * Enables CSS only zooming.
     * @var {boolean}
     */
    PDFJS.useOnlyCssZoom = (PDFJS.useOnlyCssZoom === undefined ?
        false : PDFJS.useOnlyCssZoom);

    /**
     * Controls the logging level.
     * The constants from PDFJS.VERBOSITY_LEVELS should be used:
     * - errors
     * - warnings [default]
     * - infos
     * @var {number}
     */
    PDFJS.verbosity = (PDFJS.verbosity === undefined ?
        PDFJS.VERBOSITY_LEVELS.warnings : PDFJS.verbosity);

    /**
     * The maximum supported canvas size in total pixels e.g. width * height.
     * The default value is 4096 * 4096. Use -1 for no limit.
     * @var {number}
     */
    PDFJS.maxCanvasPixels = (PDFJS.maxCanvasPixels === undefined ?
        16777216 : PDFJS.maxCanvasPixels);

    /**
     * Opens external links in a new window if enabled. The default behavior opens
     * external links in the PDF.js window.
     * @var {boolean}
     */
    PDFJS.openExternalLinksInNewWindow = (
        PDFJS.openExternalLinksInNewWindow === undefined ?
            false : PDFJS.openExternalLinksInNewWindow);

    /**
     * Document initialization / loading parameters object.
     *
     * @typedef {Object} DocumentInitParameters
     * @property {string}     url   - The URL of the PDF.
     * @property {TypedArray|Array|string} data - Binary PDF data. Use typed arrays
     *   (Uint8Array) to improve the memory usage. If PDF data is BASE64-encoded,
     *   use atob() to convert it to a binary string first.
     * @property {Object}     httpHeaders - Basic authentication headers.
     * @property {boolean}    withCredentials - Indicates whether or not cross-site
     *   Access-Control requests should be made using credentials such as cookies
     *   or authorization headers. The default is false.
     * @property {string}     password - For decrypting password-protected PDFs.
     * @property {TypedArray} initialData - A typed array with the first portion or
     *   all of the pdf data. Used by the extension since some data is already
     *   loaded before the switch to range requests.
     * @property {number}     length - The PDF file length. It's used for progress
     *   reports and range requests operations.
     * @property {PDFDataRangeTransport} range
     */

    /**
     * @typedef {Object} PDFDocumentStats
     * @property {Array} streamTypes - Used stream types in the document (an item
     *   is set to true if specific stream ID was used in the document).
     * @property {Array} fontTypes - Used font type in the document (an item is set
     *   to true if specific font ID was used in the document).
     */

    /**
     * This is the main entry point for loading a PDF and interacting with it.
     * NOTE: If a URL is used to fetch the PDF data a standard XMLHttpRequest(XHR)
     * is used, which means it must follow the same origin rules that any XHR does
     * e.g. No cross domain requests without CORS.
     *
     * @param {string|TypedArray|DocumentInitParameters|PDFDataRangeTransport} src
     * Can be a url to where a PDF is located, a typed array (Uint8Array)
     * already populated with data or parameter object.
     *
     * @param {PDFDataRangeTransport} pdfDataRangeTransport (deprecated) It is used
     * if you want to manually serve range requests for data in the PDF.
     *
     * @param {function} passwordCallback (deprecated) It is used to request a
     * password if wrong or no password was provided. The callback receives two
     * parameters: function that needs to be called with new password and reason
     * (see {PasswordResponses}).
     *
     * @param {function} progressCallback (deprecated) It is used to be able to
     * monitor the loading progress of the PDF file (necessary to implement e.g.
     * a loading bar). The callback receives an {Object} with the properties:
     * {number} loaded and {number} total.
     *
     * @return {PDFDocumentLoadingTask}
     */
    PDFJS.getDocument = function getDocument(src,
                                             pdfDataRangeTransport,
                                             passwordCallback,
                                             progressCallback) {
        var task = new PDFDocumentLoadingTask();

        // Support of the obsolete arguments (for compatibility with API v1.0)
        if (pdfDataRangeTransport) {
            if (!(pdfDataRangeTransport instanceof PDFDataRangeTransport)) {
                // Not a PDFDataRangeTransport instance, trying to add missing properties.
                pdfDataRangeTransport = Object.create(pdfDataRangeTransport);
                pdfDataRangeTransport.length = src.length;
                pdfDataRangeTransport.initialData = src.initialData;
            }
            src = Object.create(src);
            src.range = pdfDataRangeTransport;
        }
        task.onPassword = passwordCallback || null;
        task.onProgress = progressCallback || null;

        var workerInitializedCapability, transport;
        var source;
        if (typeof src === 'string') {
            source = { url: src };
        } else if (isArrayBuffer(src)) {
            source = { data: src };
        } else if (src instanceof PDFDataRangeTransport) {
            source = { range: src };
        } else {
            if (typeof src !== 'object') {
                error('Invalid parameter in getDocument, need either Uint8Array, ' +
                    'string or a parameter object');
            }
            if (!src.url && !src.data && !src.range) {
                error('Invalid parameter object: need either .data, .range or .url');
            }

            source = src;
        }

        var params = {};
        for (var key in source) {
            if (key === 'url' && typeof window !== 'undefined') {
                // The full path is required in the 'url' field.
                params[key] = combineUrl(window.location.href, source[key]);
                continue;
            } else if (key === 'range') {
                continue;
            } else if (key === 'data' && !(source[key] instanceof Uint8Array)) {
                // Converting string or array-like data to Uint8Array.
                var pdfBytes = source[key];
                if (typeof pdfBytes === 'string') {
                    params[key] = stringToBytes(pdfBytes);
                } else if (typeof pdfBytes === 'object' && pdfBytes !== null &&
                    !isNaN(pdfBytes.length)) {
                    params[key] = new Uint8Array(pdfBytes);
                } else {
                    error('Invalid PDF binary data: either typed array, string or ' +
                        'array-like object is expected in the data property.');
                }
                continue;
            }
            params[key] = source[key];
        }

        workerInitializedCapability = createPromiseCapability();
        transport = new WorkerTransport(workerInitializedCapability, source.range);
        workerInitializedCapability.promise.then(function transportInitialized() {
            transport.fetchDocument(task, params);
        });

        return task;
    };

    /**
     * PDF document loading operation.
     * @class
     */
    var PDFDocumentLoadingTask = (function PDFDocumentLoadingTaskClosure() {
        /** @constructs PDFDocumentLoadingTask */
        function PDFDocumentLoadingTask() {
            this._capability = createPromiseCapability();

            /**
             * Callback to request a password if wrong or no password was provided.
             * The callback receives two parameters: function that needs to be called
             * with new password and reason (see {PasswordResponses}).
             */
            this.onPassword = null;

            /**
             * Callback to be able to monitor the loading progress of the PDF file
             * (necessary to implement e.g. a loading bar). The callback receives
             * an {Object} with the properties: {number} loaded and {number} total.
             */
            this.onProgress = null;
        }

        PDFDocumentLoadingTask.prototype =
            /** @lends PDFDocumentLoadingTask.prototype */ {
            /**
             * @return {Promise}
             */
            get promise() {
                return this._capability.promise;
            },

            // TODO add cancel or abort method

            /**
             * Registers callbacks to indicate the document loading completion.
             *
             * @param {function} onFulfilled The callback for the loading completion.
             * @param {function} onRejected The callback for the loading failure.
             * @return {Promise} A promise that is resolved after the onFulfilled or
             *                   onRejected callback.
             */
            then: function PDFDocumentLoadingTask_then(onFulfilled, onRejected) {
                return this.promise.then.apply(this.promise, arguments);
            }
        };

        return PDFDocumentLoadingTask;
    })();

    /**
     * Abstract class to support range requests file loading.
     * @class
     */
    var PDFDataRangeTransport = (function pdfDataRangeTransportClosure() {
        /**
         * @constructs PDFDataRangeTransport
         * @param {number} length
         * @param {Uint8Array} initialData
         */
        function PDFDataRangeTransport(length, initialData) {
            this.length = length;
            this.initialData = initialData;

            this._rangeListeners = [];
            this._progressListeners = [];
            this._progressiveReadListeners = [];
            this._readyCapability = createPromiseCapability();
        }
        PDFDataRangeTransport.prototype =
            /** @lends PDFDataRangeTransport.prototype */ {
            addRangeListener:
                function PDFDataRangeTransport_addRangeListener(listener) {
                    this._rangeListeners.push(listener);
                },

            addProgressListener:
                function PDFDataRangeTransport_addProgressListener(listener) {
                    this._progressListeners.push(listener);
                },

            addProgressiveReadListener:
                function PDFDataRangeTransport_addProgressiveReadListener(listener) {
                    this._progressiveReadListeners.push(listener);
                },

            onDataRange: function PDFDataRangeTransport_onDataRange(begin, chunk) {
                var listeners = this._rangeListeners;
                for (var i = 0, n = listeners.length; i < n; ++i) {
                    listeners[i](begin, chunk);
                }
            },

            onDataProgress: function PDFDataRangeTransport_onDataProgress(loaded) {
                this._readyCapability.promise.then(function () {
                    var listeners = this._progressListeners;
                    for (var i = 0, n = listeners.length; i < n; ++i) {
                        listeners[i](loaded);
                    }
                }.bind(this));
            },

            onDataProgressiveRead:
                function PDFDataRangeTransport_onDataProgress(chunk) {
                    this._readyCapability.promise.then(function () {
                        var listeners = this._progressiveReadListeners;
                        for (var i = 0, n = listeners.length; i < n; ++i) {
                            listeners[i](chunk);
                        }
                    }.bind(this));
                },

            transportReady: function PDFDataRangeTransport_transportReady() {
                this._readyCapability.resolve();
            },

            requestDataRange:
                function PDFDataRangeTransport_requestDataRange(begin, end) {
                    throw new Error('Abstract method PDFDataRangeTransport.requestDataRange');
                }
        };
        return PDFDataRangeTransport;
    })();

    PDFJS.PDFDataRangeTransport = PDFDataRangeTransport;

    /**
     * Proxy to a PDFDocument in the worker thread. Also, contains commonly used
     * properties that can be read synchronously.
     * @class
     */
    var PDFDocumentProxy = (function PDFDocumentProxyClosure() {
        function PDFDocumentProxy(pdfInfo, transport) {
            this.pdfInfo = pdfInfo;
            this.transport = transport;
        }
        PDFDocumentProxy.prototype = /** @lends PDFDocumentProxy.prototype */ {
            /**
             * @return {number} Total number of pages the PDF contains.
             */
            get numPages() {
                return this.pdfInfo.numPages;
            },
            /**
             * @return {string} A unique ID to identify a PDF. Not guaranteed to be
             * unique.
             */
            get fingerprint() {
                return this.pdfInfo.fingerprint;
            },
            /**
             * @param {number} pageNumber The page number to get. The first page is 1.
             * @return {Promise} A promise that is resolved with a {@link PDFPageProxy}
             * object.
             */
            getPage: function PDFDocumentProxy_getPage(pageNumber) {
                return this.transport.getPage(pageNumber);
            },
            /**
             * @param {{num: number, gen: number}} ref The page reference. Must have
             *   the 'num' and 'gen' properties.
             * @return {Promise} A promise that is resolved with the page index that is
             * associated with the reference.
             */
            getPageIndex: function PDFDocumentProxy_getPageIndex(ref) {
                return this.transport.getPageIndex(ref);
            },
            /**
             * @return {Promise} A promise that is resolved with a lookup table for
             * mapping named destinations to reference numbers.
             *
             * This can be slow for large documents: use getDestination instead
             */
            getDestinations: function PDFDocumentProxy_getDestinations() {
                return this.transport.getDestinations();
            },
            /**
             * @param {string} id The named destination to get.
             * @return {Promise} A promise that is resolved with all information
             * of the given named destination.
             */
            getDestination: function PDFDocumentProxy_getDestination(id) {
                return this.transport.getDestination(id);
            },
            /**
             * @return {Promise} A promise that is resolved with a lookup table for
             * mapping named attachments to their content.
             */
            getAttachments: function PDFDocumentProxy_getAttachments() {
                return this.transport.getAttachments();
            },
            /**
             * @return {Promise} A promise that is resolved with an array of all the
             * JavaScript strings in the name tree.
             */
            getJavaScript: function PDFDocumentProxy_getJavaScript() {
                return this.transport.getJavaScript();
            },
            /**
             * @return {Promise} A promise that is resolved with an {Array} that is a
             * tree outline (if it has one) of the PDF. The tree is in the format of:
             * [
             *  {
             *   title: string,
             *   bold: boolean,
             *   italic: boolean,
             *   color: rgb array,
             *   dest: dest obj,
             *   items: array of more items like this
             *  },
             *  ...
             * ].
             */
            getOutline: function PDFDocumentProxy_getOutline() {
                return this.transport.getOutline();
            },
            /**
             * @return {Promise} A promise that is resolved with an {Object} that has
             * info and metadata properties.  Info is an {Object} filled with anything
             * available in the information dictionary and similarly metadata is a
             * {Metadata} object with information from the metadata section of the PDF.
             */
            getMetadata: function PDFDocumentProxy_getMetadata() {
                return this.transport.getMetadata();
            },
            /**
             * @return {Promise} A promise that is resolved with a TypedArray that has
             * the raw data from the PDF.
             */
            getData: function PDFDocumentProxy_getData() {
                return this.transport.getData();
            },
            /**
             * @return {Promise} A promise that is resolved when the document's data
             * is loaded. It is resolved with an {Object} that contains the length
             * property that indicates size of the PDF data in bytes.
             */
            getDownloadInfo: function PDFDocumentProxy_getDownloadInfo() {
                return this.transport.downloadInfoCapability.promise;
            },
            /**
             * @return {Promise} A promise this is resolved with current stats about
             * document structures (see {@link PDFDocumentStats}).
             */
            getStats: function PDFDocumentProxy_getStats() {
                return this.transport.getStats();
            },
            /**
             * Cleans up resources allocated by the document, e.g. created @font-face.
             */
            cleanup: function PDFDocumentProxy_cleanup() {
                this.transport.startCleanup();
            },
            /**
             * Destroys current document instance and terminates worker.
             */
            destroy: function PDFDocumentProxy_destroy() {
                this.transport.destroy();
            }
        };
        return PDFDocumentProxy;
    })();

    /**
     * Page text content.
     *
     * @typedef {Object} TextContent
     * @property {array} items - array of {@link TextItem}
     * @property {Object} styles - {@link TextStyles} objects, indexed by font
     *                    name.
     */

    /**
     * Page text content part.
     *
     * @typedef {Object} TextItem
     * @property {string} str - text content.
     * @property {string} dir - text direction: 'ttb', 'ltr' or 'rtl'.
     * @property {array} transform - transformation matrix.
     * @property {number} width - width in device space.
     * @property {number} height - height in device space.
     * @property {string} fontName - font name used by pdf.js for converted font.
     */

    /**
     * Text style.
     *
     * @typedef {Object} TextStyle
     * @property {number} ascent - font ascent.
     * @property {number} descent - font descent.
     * @property {boolean} vertical - text is in vertical mode.
     * @property {string} fontFamily - possible font family
     */

    /**
     * Page render parameters.
     *
     * @typedef {Object} RenderParameters
     * @property {Object} canvasContext - A 2D context of a DOM Canvas object.
     * @property {PDFJS.PageViewport} viewport - Rendering viewport obtained by
     *                                calling of PDFPage.getViewport method.
     * @property {string} intent - Rendering intent, can be 'display' or 'print'
     *                    (default value is 'display').
     * @property {Object} imageLayer - (optional) An object that has beginLayout,
     *                    endLayout and appendImage functions.
     * @property {function} continueCallback - (deprecated) A function that will be
     *                      called each time the rendering is paused.  To continue
     *                      rendering call the function that is the first argument
     *                      to the callback.
     */

    /**
     * PDF page operator list.
     *
     * @typedef {Object} PDFOperatorList
     * @property {Array} fnArray - Array containing the operator functions.
     * @property {Array} argsArray - Array containing the arguments of the
     *                               functions.
     */

    /**
     * Proxy to a PDFPage in the worker thread.
     * @class
     */
    var PDFPageProxy = (function PDFPageProxyClosure() {
        function PDFPageProxy(pageIndex, pageInfo, transport) {
            this.pageIndex = pageIndex;
            this.pageInfo = pageInfo;
            this.transport = transport;
            this.stats = new StatTimer();
            this.stats.enabled = !!globalScope.PDFJS.enableStats;
            this.commonObjs = transport.commonObjs;
            this.objs = new PDFObjects();
            this.cleanupAfterRender = false;
            this.pendingDestroy = false;
            this.intentStates = {};
        }
        PDFPageProxy.prototype = /** @lends PDFPageProxy.prototype */ {
            /**
             * @return {number} Page number of the page. First page is 1.
             */
            get pageNumber() {
                return this.pageIndex + 1;
            },
            /**
             * @return {number} The number of degrees the page is rotated clockwise.
             */
            get rotate() {
                return this.pageInfo.rotate;
            },
            /**
             * @return {Object} The reference that points to this page. It has 'num' and
             * 'gen' properties.
             */
            get ref() {
                return this.pageInfo.ref;
            },
            /**
             * @return {Array} An array of the visible portion of the PDF page in the
             * user space units - [x1, y1, x2, y2].
             */
            get view() {
                return this.pageInfo.view;
            },
            /**
             * @param {number} scale The desired scale of the viewport.
             * @param {number} rotate Degrees to rotate the viewport. If omitted this
             * defaults to the page rotation.
             * @return {PDFJS.PageViewport} Contains 'width' and 'height' properties
             * along with transforms required for rendering.
             */
            getViewport: function PDFPageProxy_getViewport(scale, rotate) {
                if (arguments.length < 2) {
                    rotate = this.rotate;
                }
                return new PDFJS.PageViewport(this.view, scale, rotate, 0, 0);
            },
            /**
             * @return {Promise} A promise that is resolved with an {Array} of the
             * annotation objects.
             */
            getAnnotations: function PDFPageProxy_getAnnotations() {
                if (this.annotationsPromise) {
                    return this.annotationsPromise;
                }

                var promise = this.transport.getAnnotations(this.pageIndex);
                this.annotationsPromise = promise;
                return promise;
            },
            /**
             * Begins the process of rendering a page to the desired context.
             * @param {RenderParameters} params Page render parameters.
             * @return {RenderTask} An object that contains the promise, which
             *                      is resolved when the page finishes rendering.
             */
            render: function PDFPageProxy_render(params) {
                var stats = this.stats;
                stats.time('Overall');

                // If there was a pending destroy cancel it so no cleanup happens during
                // this call to render.
                this.pendingDestroy = false;

                var renderingIntent = (params.intent === 'print' ? 'print' : 'display');

                if (!this.intentStates[renderingIntent]) {
                    this.intentStates[renderingIntent] = {};
                }
                var intentState = this.intentStates[renderingIntent];

                // If there's no displayReadyCapability yet, then the operatorList
                // was never requested before. Make the request and create the promise.
                if (!intentState.displayReadyCapability) {
                    intentState.receivingOperatorList = true;
                    intentState.displayReadyCapability = createPromiseCapability();
                    intentState.operatorList = {
                        fnArray: [],
                        argsArray: [],
                        lastChunk: false
                    };

                    this.stats.time('Page Request');
                    this.transport.messageHandler.send('RenderPageRequest', {
                        pageIndex: this.pageNumber - 1,
                        intent: renderingIntent
                    });
                }

                var internalRenderTask = new InternalRenderTask(complete, params,
                    this.objs,
                    this.commonObjs,
                    intentState.operatorList,
                    this.pageNumber);
                if (!intentState.renderTasks) {
                    intentState.renderTasks = [];
                }
                intentState.renderTasks.push(internalRenderTask);
                var renderTask = internalRenderTask.task;

                // Obsolete parameter support
                if (params.continueCallback) {
                    renderTask.onContinue = params.continueCallback;
                }

                var self = this;
                intentState.displayReadyCapability.promise.then(
                    function pageDisplayReadyPromise(transparency) {
                        if (self.pendingDestroy) {
                            complete();
                            return;
                        }
                        stats.time('Rendering');
                        internalRenderTask.initalizeGraphics(transparency);
                        internalRenderTask.operatorListChanged();
                    },
                    function pageDisplayReadPromiseError(reason) {
                        complete(reason);
                    }
                );

                function complete(error) {
                    var i = intentState.renderTasks.indexOf(internalRenderTask);
                    if (i >= 0) {
                        intentState.renderTasks.splice(i, 1);
                    }

                    if (self.cleanupAfterRender) {
                        self.pendingDestroy = true;
                    }
                    self._tryDestroy();

                    if (error) {
                        internalRenderTask.capability.reject(error);
                    } else {
                        internalRenderTask.capability.resolve();
                    }
                    stats.timeEnd('Rendering');
                    stats.timeEnd('Overall');
                }

                return renderTask;
            },

            /**
             * @return {Promise} A promise resolved with an {@link PDFOperatorList}
             * object that represents page's operator list.
             */
            getOperatorList: function PDFPageProxy_getOperatorList() {
                function operatorListChanged() {
                    if (intentState.operatorList.lastChunk) {
                        intentState.opListReadCapability.resolve(intentState.operatorList);
                    }
                }

                var renderingIntent = 'oplist';
                if (!this.intentStates[renderingIntent]) {
                    this.intentStates[renderingIntent] = {};
                }
                var intentState = this.intentStates[renderingIntent];

                if (!intentState.opListReadCapability) {
                    var opListTask = {};
                    opListTask.operatorListChanged = operatorListChanged;
                    intentState.receivingOperatorList = true;
                    intentState.opListReadCapability = createPromiseCapability();
                    intentState.renderTasks = [];
                    intentState.renderTasks.push(opListTask);
                    intentState.operatorList = {
                        fnArray: [],
                        argsArray: [],
                        lastChunk: false
                    };

                    this.transport.messageHandler.send('RenderPageRequest', {
                        pageIndex: this.pageIndex,
                        intent: renderingIntent
                    });
                }
                return intentState.opListReadCapability.promise;
            },

            /**
             * @return {Promise} That is resolved a {@link TextContent}
             * object that represent the page text content.
             */
            getTextContent: function PDFPageProxy_getTextContent() {
                return this.transport.messageHandler.sendWithPromise('GetTextContent', {
                    pageIndex: this.pageNumber - 1
                });
            },
            /**
             * Destroys resources allocated by the page.
             */
            destroy: function PDFPageProxy_destroy() {
                this.pendingDestroy = true;
                this._tryDestroy();
            },
            /**
             * For internal use only. Attempts to clean up if rendering is in a state
             * where that's possible.
             * @ignore
             */
            _tryDestroy: function PDFPageProxy__destroy() {
                if (!this.pendingDestroy ||
                    Object.keys(this.intentStates).some(function(intent) {
                        var intentState = this.intentStates[intent];
                        return (intentState.renderTasks.length !== 0 ||
                            intentState.receivingOperatorList);
                    }, this)) {
                    return;
                }

                Object.keys(this.intentStates).forEach(function(intent) {
                    delete this.intentStates[intent];
                }, this);
                this.objs.clear();
                this.annotationsPromise = null;
                this.pendingDestroy = false;
            },
            /**
             * For internal use only.
             * @ignore
             */
            _startRenderPage: function PDFPageProxy_startRenderPage(transparency,
                                                                    intent) {
                var intentState = this.intentStates[intent];
                // TODO Refactor RenderPageRequest to separate rendering
                // and operator list logic
                if (intentState.displayReadyCapability) {
                    intentState.displayReadyCapability.resolve(transparency);
                }
            },
            /**
             * For internal use only.
             * @ignore
             */
            _renderPageChunk: function PDFPageProxy_renderPageChunk(operatorListChunk,
                                                                    intent) {
                var intentState = this.intentStates[intent];
                var i, ii;
                // Add the new chunk to the current operator list.
                for (i = 0, ii = operatorListChunk.length; i < ii; i++) {
                    intentState.operatorList.fnArray.push(operatorListChunk.fnArray[i]);
                    intentState.operatorList.argsArray.push(
                        operatorListChunk.argsArray[i]);
                }
                intentState.operatorList.lastChunk = operatorListChunk.lastChunk;

                // Notify all the rendering tasks there are more operators to be consumed.
                for (i = 0; i < intentState.renderTasks.length; i++) {
                    intentState.renderTasks[i].operatorListChanged();
                }

                if (operatorListChunk.lastChunk) {
                    intentState.receivingOperatorList = false;
                    this._tryDestroy();
                }
            }
        };
        return PDFPageProxy;
    })();

    /**
     * For internal use only.
     * @ignore
     */
    var WorkerTransport = (function WorkerTransportClosure() {
        function WorkerTransport(workerInitializedCapability, pdfDataRangeTransport) {
            this.pdfDataRangeTransport = pdfDataRangeTransport;
            this.workerInitializedCapability = workerInitializedCapability;
            this.commonObjs = new PDFObjects();

            this.loadingTask = null;

            this.pageCache = [];
            this.pagePromises = [];
            this.downloadInfoCapability = createPromiseCapability();

            // If worker support isn't disabled explicit and the browser has worker
            // support, create a new web worker and test if it/the browser fullfills
            // all requirements to run parts of pdf.js in a web worker.
            // Right now, the requirement is, that an Uint8Array is still an Uint8Array
            // as it arrives on the worker. Chrome added this with version 15.
            if (!globalScope.PDFJS.disableWorker && typeof Worker !== 'undefined') {
                var workerSrc = PDFJS.workerSrc;
                if (!workerSrc) {
                    error('No PDFJS.workerSrc specified');
                }

                try {
                    // Some versions of FF can't create a worker on localhost, see:
                    // https://bugzilla.mozilla.org/show_bug.cgi?id=683280
                    var worker = new Worker(workerSrc);
                    var messageHandler = new MessageHandler('main', worker);
                    this.messageHandler = messageHandler;

                    messageHandler.on('test', function transportTest(data) {
                        var supportTypedArray = data && data.supportTypedArray;
                        if (supportTypedArray) {
                            this.worker = worker;
                            if (!data.supportTransfers) {
                                PDFJS.postMessageTransfers = false;
                            }
                            this.setupMessageHandler(messageHandler);
                            workerInitializedCapability.resolve();
                        } else {
                            this.setupFakeWorker();
                        }
                    }.bind(this));

                    var testObj = new Uint8Array([PDFJS.postMessageTransfers ? 255 : 0]);
                    // Some versions of Opera throw a DATA_CLONE_ERR on serializing the
                    // typed array. Also, checking if we can use transfers.
                    try {
                        messageHandler.send('test', testObj, [testObj.buffer]);
                    } catch (ex) {
                        info('Cannot use postMessage transfers');
                        testObj[0] = 0;
                        messageHandler.send('test', testObj);
                    }
                    return;
                } catch (e) {
                    info('The worker has been disabled.');
                }
            }
            // Either workers are disabled, not supported or have thrown an exception.
            // Thus, we fallback to a faked worker.
            this.setupFakeWorker();
        }
        WorkerTransport.prototype = {
            destroy: function WorkerTransport_destroy() {
                this.pageCache = [];
                this.pagePromises = [];
                var self = this;
                this.messageHandler.sendWithPromise('Terminate', null).then(function () {
                    FontLoader.clear();
                    if (self.worker) {
                        self.worker.terminate();
                    }
                });
            },

            setupFakeWorker: function WorkerTransport_setupFakeWorker() {
                globalScope.PDFJS.disableWorker = true;

                if (!PDFJS.fakeWorkerFilesLoadedCapability) {
                    PDFJS.fakeWorkerFilesLoadedCapability = createPromiseCapability();
                    // In the developer build load worker_loader which in turn loads all the
                    // other files and resolves the promise. In production only the
                    // pdf.worker.js file is needed.
                    Util.loadScript(PDFJS.workerSrc, function() {
                        PDFJS.fakeWorkerFilesLoadedCapability.resolve();
                    });
                }
                PDFJS.fakeWorkerFilesLoadedCapability.promise.then(function () {
                    warn('Setting up fake worker.');
                    // If we don't use a worker, just post/sendMessage to the main thread.
                    var fakeWorker = {
                        postMessage: function WorkerTransport_postMessage(obj) {
                            fakeWorker.onmessage({data: obj});
                        },
                        terminate: function WorkerTransport_terminate() {}
                    };

                    var messageHandler = new MessageHandler('main', fakeWorker);
                    this.setupMessageHandler(messageHandler);

                    // If the main thread is our worker, setup the handling for the messages
                    // the main thread sends to it self.
                    PDFJS.WorkerMessageHandler.setup(messageHandler);

                    this.workerInitializedCapability.resolve();
                }.bind(this));
            },

            setupMessageHandler:
                function WorkerTransport_setupMessageHandler(messageHandler) {
                    this.messageHandler = messageHandler;

                    function updatePassword(password) {
                        messageHandler.send('UpdatePassword', password);
                    }

                    var pdfDataRangeTransport = this.pdfDataRangeTransport;
                    if (pdfDataRangeTransport) {
                        pdfDataRangeTransport.addRangeListener(function(begin, chunk) {
                            messageHandler.send('OnDataRange', {
                                begin: begin,
                                chunk: chunk
                            });
                        });

                        pdfDataRangeTransport.addProgressListener(function(loaded) {
                            messageHandler.send('OnDataProgress', {
                                loaded: loaded
                            });
                        });

                        pdfDataRangeTransport.addProgressiveReadListener(function(chunk) {
                            messageHandler.send('OnDataRange', {
                                chunk: chunk
                            });
                        });

                        messageHandler.on('RequestDataRange',
                            function transportDataRange(data) {
                                pdfDataRangeTransport.requestDataRange(data.begin, data.end);
                            }, this);
                    }

                    messageHandler.on('GetDoc', function transportDoc(data) {
                        var pdfInfo = data.pdfInfo;
                        this.numPages = data.pdfInfo.numPages;
                        var pdfDocument = new PDFDocumentProxy(pdfInfo, this);
                        this.pdfDocument = pdfDocument;
                        this.loadingTask._capability.resolve(pdfDocument);
                    }, this);

                    messageHandler.on('NeedPassword',
                        function transportNeedPassword(exception) {
                            var loadingTask = this.loadingTask;
                            if (loadingTask.onPassword) {
                                return loadingTask.onPassword(updatePassword,
                                    PasswordResponses.NEED_PASSWORD);
                            }
                            loadingTask._capability.reject(
                                new PasswordException(exception.message, exception.code));
                        }, this);

                    messageHandler.on('IncorrectPassword',
                        function transportIncorrectPassword(exception) {
                            var loadingTask = this.loadingTask;
                            if (loadingTask.onPassword) {
                                return loadingTask.onPassword(updatePassword,
                                    PasswordResponses.INCORRECT_PASSWORD);
                            }
                            loadingTask._capability.reject(
                                new PasswordException(exception.message, exception.code));
                        }, this);

                    messageHandler.on('InvalidPDF', function transportInvalidPDF(exception) {
                        this.loadingTask._capability.reject(
                            new InvalidPDFException(exception.message));
                    }, this);

                    messageHandler.on('MissingPDF', function transportMissingPDF(exception) {
                        this.loadingTask._capability.reject(
                            new MissingPDFException(exception.message));
                    }, this);

                    messageHandler.on('UnexpectedResponse',
                        function transportUnexpectedResponse(exception) {
                            this.loadingTask._capability.reject(
                                new UnexpectedResponseException(exception.message, exception.status));
                        }, this);

                    messageHandler.on('UnknownError',
                        function transportUnknownError(exception) {
                            this.loadingTask._capability.reject(
                                new UnknownErrorException(exception.message, exception.details));
                        }, this);

                    messageHandler.on('DataLoaded', function transportPage(data) {
                        this.downloadInfoCapability.resolve(data);
                    }, this);

                    messageHandler.on('PDFManagerReady', function transportPage(data) {
                        if (this.pdfDataRangeTransport) {
                            this.pdfDataRangeTransport.transportReady();
                        }
                    }, this);

                    messageHandler.on('StartRenderPage', function transportRender(data) {
                        var page = this.pageCache[data.pageIndex];

                        page.stats.timeEnd('Page Request');
                        page._startRenderPage(data.transparency, data.intent);
                    }, this);

                    messageHandler.on('RenderPageChunk', function transportRender(data) {
                        var page = this.pageCache[data.pageIndex];

                        page._renderPageChunk(data.operatorList, data.intent);
                    }, this);

                    messageHandler.on('commonobj', function transportObj(data) {
                        var id = data[0];
                        var type = data[1];
                        if (this.commonObjs.hasData(id)) {
                            return;
                        }

                        switch (type) {
                            case 'Font':
                                var exportedData = data[2];

                                var font;
                                if ('error' in exportedData) {
                                    var error = exportedData.error;
                                    warn('Error during font loading: ' + error);
                                    this.commonObjs.resolve(id, error);
                                    break;
                                } else {
                                    font = new FontFaceObject(exportedData);
                                }

                                FontLoader.bind(
                                    [font],
                                    function fontReady(fontObjs) {
                                        this.commonObjs.resolve(id, font);
                                    }.bind(this)
                                );
                                break;
                            case 'FontPath':
                                this.commonObjs.resolve(id, data[2]);
                                break;
                            default:
                                error('Got unknown common object type ' + type);
                        }
                    }, this);

                    messageHandler.on('obj', function transportObj(data) {
                        var id = data[0];
                        var pageIndex = data[1];
                        var type = data[2];
                        var pageProxy = this.pageCache[pageIndex];
                        var imageData;
                        if (pageProxy.objs.hasData(id)) {
                            return;
                        }

                        switch (type) {
                            case 'JpegStream':
                                imageData = data[3];
                                loadJpegStream(id, imageData, pageProxy.objs);
                                break;
                            case 'Image':
                                imageData = data[3];
                                pageProxy.objs.resolve(id, imageData);

                                // heuristics that will allow not to store large data
                                var MAX_IMAGE_SIZE_TO_STORE = 8000000;
                                if (imageData && 'data' in imageData &&
                                    imageData.data.length > MAX_IMAGE_SIZE_TO_STORE) {
                                    pageProxy.cleanupAfterRender = true;
                                }
                                break;
                            default:
                                error('Got unknown object type ' + type);
                        }
                    }, this);

                    messageHandler.on('DocProgress', function transportDocProgress(data) {
                        var loadingTask = this.loadingTask;
                        if (loadingTask.onProgress) {
                            loadingTask.onProgress({
                                loaded: data.loaded,
                                total: data.total
                            });
                        }
                    }, this);

                    messageHandler.on('PageError', function transportError(data) {
                        var page = this.pageCache[data.pageNum - 1];
                        var intentState = page.intentStates[data.intent];
                        if (intentState.displayReadyCapability) {
                            intentState.displayReadyCapability.reject(data.error);
                        } else {
                            error(data.error);
                        }
                    }, this);

                    messageHandler.on('JpegDecode', function(data) {
                        var imageUrl = data[0];
                        var components = data[1];
                        if (components !== 3 && components !== 1) {
                            return Promise.reject(
                                new Error('Only 3 components or 1 component can be returned'));
                        }

                        return new Promise(function (resolve, reject) {
                            var img = new Image();
                            img.onload = function () {
                                var width = img.width;
                                var height = img.height;
                                var size = width * height;
                                var rgbaLength = size * 4;
                                var buf = new Uint8Array(size * components);
                                var tmpCanvas = createScratchCanvas(width, height);
                                var tmpCtx = tmpCanvas.getContext('2d');
                                tmpCtx.drawImage(img, 0, 0);
                                var data = tmpCtx.getImageData(0, 0, width, height).data;
                                var i, j;

                                if (components === 3) {
                                    for (i = 0, j = 0; i < rgbaLength; i += 4, j += 3) {
                                        buf[j] = data[i];
                                        buf[j + 1] = data[i + 1];
                                        buf[j + 2] = data[i + 2];
                                    }
                                } else if (components === 1) {
                                    for (i = 0, j = 0; i < rgbaLength; i += 4, j++) {
                                        buf[j] = data[i];
                                    }
                                }
                                resolve({ data: buf, width: width, height: height});
                            };
                            img.onerror = function () {
                                reject(new Error('JpegDecode failed to load image'));
                            };
                            img.src = imageUrl;
                        });
                    });
                },

            fetchDocument: function WorkerTransport_fetchDocument(loadingTask, source) {
                this.loadingTask = loadingTask;

                source.disableAutoFetch = PDFJS.disableAutoFetch;
                source.disableStream = PDFJS.disableStream;
                source.chunkedViewerLoading = !!this.pdfDataRangeTransport;
                if (this.pdfDataRangeTransport) {
                    source.length = this.pdfDataRangeTransport.length;
                    source.initialData = this.pdfDataRangeTransport.initialData;
                }
                this.messageHandler.send('GetDocRequest', {
                    source: source,
                    disableRange: PDFJS.disableRange,
                    maxImageSize: PDFJS.maxImageSize,
                    cMapUrl: PDFJS.cMapUrl,
                    cMapPacked: PDFJS.cMapPacked,
                    disableFontFace: PDFJS.disableFontFace,
                    disableCreateObjectURL: PDFJS.disableCreateObjectURL,
                    verbosity: PDFJS.verbosity
                });
            },

            getData: function WorkerTransport_getData() {
                return this.messageHandler.sendWithPromise('GetData', null);
            },

            getPage: function WorkerTransport_getPage(pageNumber, capability) {
                if (pageNumber <= 0 || pageNumber > this.numPages ||
                    (pageNumber|0) !== pageNumber) {
                    return Promise.reject(new Error('Invalid page request'));
                }

                var pageIndex = pageNumber - 1;
                if (pageIndex in this.pagePromises) {
                    return this.pagePromises[pageIndex];
                }
                var promise = this.messageHandler.sendWithPromise('GetPage', {
                    pageIndex: pageIndex
                }).then(function (pageInfo) {
                    var page = new PDFPageProxy(pageIndex, pageInfo, this);
                    this.pageCache[pageIndex] = page;
                    return page;
                }.bind(this));
                this.pagePromises[pageIndex] = promise;
                return promise;
            },

            getPageIndex: function WorkerTransport_getPageIndexByRef(ref) {
                return this.messageHandler.sendWithPromise('GetPageIndex', { ref: ref });
            },

            getAnnotations: function WorkerTransport_getAnnotations(pageIndex) {
                return this.messageHandler.sendWithPromise('GetAnnotations',
                    { pageIndex: pageIndex });
            },

            getDestinations: function WorkerTransport_getDestinations() {
                return this.messageHandler.sendWithPromise('GetDestinations', null);
            },

            getDestination: function WorkerTransport_getDestination(id) {
                return this.messageHandler.sendWithPromise('GetDestination', { id: id } );
            },

            getAttachments: function WorkerTransport_getAttachments() {
                return this.messageHandler.sendWithPromise('GetAttachments', null);
            },

            getJavaScript: function WorkerTransport_getJavaScript() {
                return this.messageHandler.sendWithPromise('GetJavaScript', null);
            },

            getOutline: function WorkerTransport_getOutline() {
                return this.messageHandler.sendWithPromise('GetOutline', null);
            },

            getMetadata: function WorkerTransport_getMetadata() {
                return this.messageHandler.sendWithPromise('GetMetadata', null).
                then(function transportMetadata(results) {
                    return {
                        info: results[0],
                        metadata: (results[1] ? new PDFJS.Metadata(results[1]) : null)
                    };
                });
            },

            getStats: function WorkerTransport_getStats() {
                return this.messageHandler.sendWithPromise('GetStats', null);
            },

            startCleanup: function WorkerTransport_startCleanup() {
                this.messageHandler.sendWithPromise('Cleanup', null).
                then(function endCleanup() {
                    for (var i = 0, ii = this.pageCache.length; i < ii; i++) {
                        var page = this.pageCache[i];
                        if (page) {
                            page.destroy();
                        }
                    }
                    this.commonObjs.clear();
                    FontLoader.clear();
                }.bind(this));
            }
        };
        return WorkerTransport;

    })();

    /**
     * A PDF document and page is built of many objects. E.g. there are objects
     * for fonts, images, rendering code and such. These objects might get processed
     * inside of a worker. The `PDFObjects` implements some basic functions to
     * manage these objects.
     * @ignore
     */
    var PDFObjects = (function PDFObjectsClosure() {
        function PDFObjects() {
            this.objs = {};
        }

        PDFObjects.prototype = {
            /**
             * Internal function.
             * Ensures there is an object defined for `objId`.
             */
            ensureObj: function PDFObjects_ensureObj(objId) {
                if (this.objs[objId]) {
                    return this.objs[objId];
                }

                var obj = {
                    capability: createPromiseCapability(),
                    data: null,
                    resolved: false
                };
                this.objs[objId] = obj;

                return obj;
            },

            /**
             * If called *without* callback, this returns the data of `objId` but the
             * object needs to be resolved. If it isn't, this function throws.
             *
             * If called *with* a callback, the callback is called with the data of the
             * object once the object is resolved. That means, if you call this
             * function and the object is already resolved, the callback gets called
             * right away.
             */
            get: function PDFObjects_get(objId, callback) {
                // If there is a callback, then the get can be async and the object is
                // not required to be resolved right now
                if (callback) {
                    this.ensureObj(objId).capability.promise.then(callback);
                    return null;
                }

                // If there isn't a callback, the user expects to get the resolved data
                // directly.
                var obj = this.objs[objId];

                // If there isn't an object yet or the object isn't resolved, then the
                // data isn't ready yet!
                if (!obj || !obj.resolved) {
                    error('Requesting object that isn\'t resolved yet ' + objId);
                }

                return obj.data;
            },

            /**
             * Resolves the object `objId` with optional `data`.
             */
            resolve: function PDFObjects_resolve(objId, data) {
                var obj = this.ensureObj(objId);

                obj.resolved = true;
                obj.data = data;
                obj.capability.resolve(data);
            },

            isResolved: function PDFObjects_isResolved(objId) {
                var objs = this.objs;

                if (!objs[objId]) {
                    return false;
                } else {
                    return objs[objId].resolved;
                }
            },

            hasData: function PDFObjects_hasData(objId) {
                return this.isResolved(objId);
            },

            /**
             * Returns the data of `objId` if object exists, null otherwise.
             */
            getData: function PDFObjects_getData(objId) {
                var objs = this.objs;
                if (!objs[objId] || !objs[objId].resolved) {
                    return null;
                } else {
                    return objs[objId].data;
                }
            },

            clear: function PDFObjects_clear() {
                this.objs = {};
            }
        };
        return PDFObjects;
    })();

    /**
     * Allows controlling of the rendering tasks.
     * @class
     */
    var RenderTask = (function RenderTaskClosure() {
        function RenderTask(internalRenderTask) {
            this._internalRenderTask = internalRenderTask;

            /**
             * Callback for incremental rendering -- a function that will be called
             * each time the rendering is paused.  To continue rendering call the
             * function that is the first argument to the callback.
             * @type {function}
             */
            this.onContinue = null;
        }

        RenderTask.prototype = /** @lends RenderTask.prototype */ {
            /**
             * Promise for rendering task completion.
             * @return {Promise}
             */
            get promise() {
                return this._internalRenderTask.capability.promise;
            },

            /**
             * Cancels the rendering task. If the task is currently rendering it will
             * not be cancelled until graphics pauses with a timeout. The promise that
             * this object extends will resolved when cancelled.
             */
            cancel: function RenderTask_cancel() {
                this._internalRenderTask.cancel();
            },

            /**
             * Registers callbacks to indicate the rendering task completion.
             *
             * @param {function} onFulfilled The callback for the rendering completion.
             * @param {function} onRejected The callback for the rendering failure.
             * @return {Promise} A promise that is resolved after the onFulfilled or
             *                   onRejected callback.
             */
            then: function RenderTask_then(onFulfilled, onRejected) {
                return this.promise.then.apply(this.promise, arguments);
            }
        };

        return RenderTask;
    })();

    /**
     * For internal use only.
     * @ignore
     */
    var InternalRenderTask = (function InternalRenderTaskClosure() {

        function InternalRenderTask(callback, params, objs, commonObjs, operatorList,
                                    pageNumber) {
            this.callback = callback;
            this.params = params;
            this.objs = objs;
            this.commonObjs = commonObjs;
            this.operatorListIdx = null;
            this.operatorList = operatorList;
            this.pageNumber = pageNumber;
            this.running = false;
            this.graphicsReadyCallback = null;
            this.graphicsReady = false;
            this.cancelled = false;
            this.capability = createPromiseCapability();
            this.task = new RenderTask(this);
            // caching this-bound methods
            this._continueBound = this._continue.bind(this);
            this._scheduleNextBound = this._scheduleNext.bind(this);
            this._nextBound = this._next.bind(this);
        }

        InternalRenderTask.prototype = {

            initalizeGraphics:
                function InternalRenderTask_initalizeGraphics(transparency) {

                    if (this.cancelled) {
                        return;
                    }
                    if (PDFJS.pdfBug && 'StepperManager' in globalScope &&
                        globalScope.StepperManager.enabled) {
                        this.stepper = globalScope.StepperManager.create(this.pageNumber - 1);
                        this.stepper.init(this.operatorList);
                        this.stepper.nextBreakPoint = this.stepper.getNextBreakPoint();
                    }

                    var params = this.params;
                    this.gfx = new CanvasGraphics(params.canvasContext, this.commonObjs,
                        this.objs, params.imageLayer);

                    this.gfx.beginDrawing(params.viewport, transparency);
                    this.operatorListIdx = 0;
                    this.graphicsReady = true;
                    if (this.graphicsReadyCallback) {
                        this.graphicsReadyCallback();
                    }
                },

            cancel: function InternalRenderTask_cancel() {
                this.running = false;
                this.cancelled = true;
                this.callback('cancelled');
            },

            operatorListChanged: function InternalRenderTask_operatorListChanged() {
                if (!this.graphicsReady) {
                    if (!this.graphicsReadyCallback) {
                        this.graphicsReadyCallback = this._continueBound;
                    }
                    return;
                }

                if (this.stepper) {
                    this.stepper.updateOperatorList(this.operatorList);
                }

                if (this.running) {
                    return;
                }
                this._continue();
            },

            _continue: function InternalRenderTask__continue() {
                this.running = true;
                if (this.cancelled) {
                    return;
                }
                if (this.task.onContinue) {
                    this.task.onContinue.call(this.task, this._scheduleNextBound);
                } else {
                    this._scheduleNext();
                }
            },

            _scheduleNext: function InternalRenderTask__scheduleNext() {
                window.requestAnimationFrame(this._nextBound);
            },

            _next: function InternalRenderTask__next() {
                if (this.cancelled) {
                    return;
                }
                this.operatorListIdx = this.gfx.executeOperatorList(this.operatorList,
                    this.operatorListIdx,
                    this._continueBound,
                    this.stepper);
                if (this.operatorListIdx === this.operatorList.argsArray.length) {
                    this.running = false;
                    if (this.operatorList.lastChunk) {
                        this.gfx.endDrawing();
                        this.callback();
                    }
                }
            }

        };

        return InternalRenderTask;
    })();


    var Metadata = PDFJS.Metadata = (function MetadataClosure() {
        function fixMetadata(meta) {
            return meta.replace(/>\\376\\377([^<]+)/g, function(all, codes) {
                var bytes = codes.replace(/\\([0-3])([0-7])([0-7])/g,
                    function(code, d1, d2, d3) {
                        return String.fromCharCode(d1 * 64 + d2 * 8 + d3 * 1);
                    });
                var chars = '';
                for (var i = 0; i < bytes.length; i += 2) {
                    var code = bytes.charCodeAt(i) * 256 + bytes.charCodeAt(i + 1);
                    chars += code >= 32 && code < 127 && code !== 60 && code !== 62 &&
                    code !== 38 && false ? String.fromCharCode(code) :
                        '&#x' + (0x10000 + code).toString(16).substring(1) + ';';
                }
                return '>' + chars;
            });
        }

        function Metadata(meta) {
            if (typeof meta === 'string') {
                // Ghostscript produces invalid metadata
                meta = fixMetadata(meta);

                var parser = new DOMParser();
                meta = parser.parseFromString(meta, 'application/xml');
            } else if (!(meta instanceof Document)) {
                error('Metadata: Invalid metadata object');
            }

            this.metaDocument = meta;
            this.metadata = {};
            this.parse();
        }

        Metadata.prototype = {
            parse: function Metadata_parse() {
                var doc = this.metaDocument;
                var rdf = doc.documentElement;

                if (rdf.nodeName.toLowerCase() !== 'rdf:rdf') { // Wrapped in <xmpmeta>
                    rdf = rdf.firstChild;
                    while (rdf && rdf.nodeName.toLowerCase() !== 'rdf:rdf') {
                        rdf = rdf.nextSibling;
                    }
                }

                var nodeName = (rdf) ? rdf.nodeName.toLowerCase() : null;
                if (!rdf || nodeName !== 'rdf:rdf' || !rdf.hasChildNodes()) {
                    return;
                }

                var children = rdf.childNodes, desc, entry, name, i, ii, length, iLength;
                for (i = 0, length = children.length; i < length; i++) {
                    desc = children[i];
                    if (desc.nodeName.toLowerCase() !== 'rdf:description') {
                        continue;
                    }

                    for (ii = 0, iLength = desc.childNodes.length; ii < iLength; ii++) {
                        if (desc.childNodes[ii].nodeName.toLowerCase() !== '#text') {
                            entry = desc.childNodes[ii];
                            name = entry.nodeName.toLowerCase();
                            this.metadata[name] = entry.textContent.trim();
                        }
                    }
                }
            },

            get: function Metadata_get(name) {
                return this.metadata[name] || null;
            },

            has: function Metadata_has(name) {
                return typeof this.metadata[name] !== 'undefined';
            }
        };

        return Metadata;
    })();


// <canvas> contexts store most of the state we need natively.
// However, PDF needs a bit more state, which we store here.

// Minimal font size that would be used during canvas fillText operations.
    var MIN_FONT_SIZE = 16;
// Maximum font size that would be used during canvas fillText operations.
    var MAX_FONT_SIZE = 100;
    var MAX_GROUP_SIZE = 4096;

// Heuristic value used when enforcing minimum line widths.
    var MIN_WIDTH_FACTOR = 0.65;

    var COMPILE_TYPE3_GLYPHS = true;
    var MAX_SIZE_TO_COMPILE = 1000;

    var FULL_CHUNK_HEIGHT = 16;

    function createScratchCanvas(width, height) {
        var canvas = document.createElement('canvas');
        canvas.width = width;
        canvas.height = height;
        return canvas;
    }

    function addContextCurrentTransform(ctx) {
        // If the context doesn't expose a `mozCurrentTransform`, add a JS based on.
        if (!ctx.mozCurrentTransform) {
            // Store the original context
            ctx._scaleX = ctx._scaleX || 1.0;
            ctx._scaleY = ctx._scaleY || 1.0;
            ctx._originalSave = ctx.save;
            ctx._originalRestore = ctx.restore;
            ctx._originalRotate = ctx.rotate;
            ctx._originalScale = ctx.scale;
            ctx._originalTranslate = ctx.translate;
            ctx._originalTransform = ctx.transform;
            ctx._originalSetTransform = ctx.setTransform;

            ctx._transformMatrix = [ctx._scaleX, 0, 0, ctx._scaleY, 0, 0];
            ctx._transformStack = [];

            Object.defineProperty(ctx, 'mozCurrentTransform', {
                get: function getCurrentTransform() {
                    return this._transformMatrix;
                }
            });

            Object.defineProperty(ctx, 'mozCurrentTransformInverse', {
                get: function getCurrentTransformInverse() {
                    // Calculation done using WolframAlpha:
                    // http://www.wolframalpha.com/input/?
                    //   i=Inverse+{{a%2C+c%2C+e}%2C+{b%2C+d%2C+f}%2C+{0%2C+0%2C+1}}

                    var m = this._transformMatrix;
                    var a = m[0], b = m[1], c = m[2], d = m[3], e = m[4], f = m[5];

                    var ad_bc = a * d - b * c;
                    var bc_ad = b * c - a * d;

                    return [
                        d / ad_bc,
                        b / bc_ad,
                        c / bc_ad,
                        a / ad_bc,
                        (d * e - c * f) / bc_ad,
                        (b * e - a * f) / ad_bc
                    ];
                }
            });

            ctx.save = function ctxSave() {
                var old = this._transformMatrix;
                this._transformStack.push(old);
                this._transformMatrix = old.slice(0, 6);

                this._originalSave();
            };

            ctx.restore = function ctxRestore() {
                var prev = this._transformStack.pop();
                if (prev) {
                    this._transformMatrix = prev;
                    this._originalRestore();
                }
            };

            ctx.translate = function ctxTranslate(x, y) {
                var m = this._transformMatrix;
                m[4] = m[0] * x + m[2] * y + m[4];
                m[5] = m[1] * x + m[3] * y + m[5];

                this._originalTranslate(x, y);
            };

            ctx.scale = function ctxScale(x, y) {
                var m = this._transformMatrix;
                m[0] = m[0] * x;
                m[1] = m[1] * x;
                m[2] = m[2] * y;
                m[3] = m[3] * y;

                this._originalScale(x, y);
            };

            ctx.transform = function ctxTransform(a, b, c, d, e, f) {
                var m = this._transformMatrix;
                this._transformMatrix = [
                    m[0] * a + m[2] * b,
                    m[1] * a + m[3] * b,
                    m[0] * c + m[2] * d,
                    m[1] * c + m[3] * d,
                    m[0] * e + m[2] * f + m[4],
                    m[1] * e + m[3] * f + m[5]
                ];

                ctx._originalTransform(a, b, c, d, e, f);
            };

            ctx.setTransform = function ctxSetTransform(a, b, c, d, e, f) {
                this._transformMatrix = [a, b, c, d, e, f];

                ctx._originalSetTransform(a, b, c, d, e, f);
            };

            ctx.rotate = function ctxRotate(angle) {
                var cosValue = Math.cos(angle);
                var sinValue = Math.sin(angle);

                var m = this._transformMatrix;
                this._transformMatrix = [
                    m[0] * cosValue + m[2] * sinValue,
                    m[1] * cosValue + m[3] * sinValue,
                    m[0] * (-sinValue) + m[2] * cosValue,
                    m[1] * (-sinValue) + m[3] * cosValue,
                    m[4],
                    m[5]
                ];

                this._originalRotate(angle);
            };
        }
    }

    var CachedCanvases = (function CachedCanvasesClosure() {
        var cache = {};
        return {
            getCanvas: function CachedCanvases_getCanvas(id, width, height,
                                                         trackTransform) {
                var canvasEntry;
                if (cache[id] !== undefined) {
                    canvasEntry = cache[id];
                    canvasEntry.canvas.width = width;
                    canvasEntry.canvas.height = height;
                    // reset canvas transform for emulated mozCurrentTransform, if needed
                    canvasEntry.context.setTransform(1, 0, 0, 1, 0, 0);
                } else {
                    var canvas = createScratchCanvas(width, height);
                    var ctx = canvas.getContext('2d');
                    if (trackTransform) {
                        addContextCurrentTransform(ctx);
                    }
                    cache[id] = canvasEntry = {canvas: canvas, context: ctx};
                }
                return canvasEntry;
            },
            clear: function () {
                for (var id in cache) {
                    var canvasEntry = cache[id];
                    // Zeroing the width and height causes Firefox to release graphics
                    // resources immediately, which can greatly reduce memory consumption.
                    canvasEntry.canvas.width = 0;
                    canvasEntry.canvas.height = 0;
                    delete cache[id];
                }
            }
        };
    })();

    function compileType3Glyph(imgData) {
        var POINT_TO_PROCESS_LIMIT = 1000;

        var width = imgData.width, height = imgData.height;
        var i, j, j0, width1 = width + 1;
        var points = new Uint8Array(width1 * (height + 1));
        var POINT_TYPES =
            new Uint8Array([0, 2, 4, 0, 1, 0, 5, 4, 8, 10, 0, 8, 0, 2, 1, 0]);

        // decodes bit-packed mask data
        var lineSize = (width + 7) & ~7, data0 = imgData.data;
        var data = new Uint8Array(lineSize * height), pos = 0, ii;
        for (i = 0, ii = data0.length; i < ii; i++) {
            var mask = 128, elem = data0[i];
            while (mask > 0) {
                data[pos++] = (elem & mask) ? 0 : 255;
                mask >>= 1;
            }
        }

        // finding iteresting points: every point is located between mask pixels,
        // so there will be points of the (width + 1)x(height + 1) grid. Every point
        // will have flags assigned based on neighboring mask pixels:
        //   4 | 8
        //   --P--
        //   2 | 1
        // We are interested only in points with the flags:
        //   - outside corners: 1, 2, 4, 8;
        //   - inside corners: 7, 11, 13, 14;
        //   - and, intersections: 5, 10.
        var count = 0;
        pos = 0;
        if (data[pos] !== 0) {
            points[0] = 1;
            ++count;
        }
        for (j = 1; j < width; j++) {
            if (data[pos] !== data[pos + 1]) {
                points[j] = data[pos] ? 2 : 1;
                ++count;
            }
            pos++;
        }
        if (data[pos] !== 0) {
            points[j] = 2;
            ++count;
        }
        for (i = 1; i < height; i++) {
            pos = i * lineSize;
            j0 = i * width1;
            if (data[pos - lineSize] !== data[pos]) {
                points[j0] = data[pos] ? 1 : 8;
                ++count;
            }
            // 'sum' is the position of the current pixel configuration in the 'TYPES'
            // array (in order 8-1-2-4, so we can use '>>2' to shift the column).
            var sum = (data[pos] ? 4 : 0) + (data[pos - lineSize] ? 8 : 0);
            for (j = 1; j < width; j++) {
                sum = (sum >> 2) + (data[pos + 1] ? 4 : 0) +
                    (data[pos - lineSize + 1] ? 8 : 0);
                if (POINT_TYPES[sum]) {
                    points[j0 + j] = POINT_TYPES[sum];
                    ++count;
                }
                pos++;
            }
            if (data[pos - lineSize] !== data[pos]) {
                points[j0 + j] = data[pos] ? 2 : 4;
                ++count;
            }

            if (count > POINT_TO_PROCESS_LIMIT) {
                return null;
            }
        }

        pos = lineSize * (height - 1);
        j0 = i * width1;
        if (data[pos] !== 0) {
            points[j0] = 8;
            ++count;
        }
        for (j = 1; j < width; j++) {
            if (data[pos] !== data[pos + 1]) {
                points[j0 + j] = data[pos] ? 4 : 8;
                ++count;
            }
            pos++;
        }
        if (data[pos] !== 0) {
            points[j0 + j] = 4;
            ++count;
        }
        if (count > POINT_TO_PROCESS_LIMIT) {
            return null;
        }

        // building outlines
        var steps = new Int32Array([0, width1, -1, 0, -width1, 0, 0, 0, 1]);
        var outlines = [];
        for (i = 0; count && i <= height; i++) {
            var p = i * width1;
            var end = p + width;
            while (p < end && !points[p]) {
                p++;
            }
            if (p === end) {
                continue;
            }
            var coords = [p % width1, i];

            var type = points[p], p0 = p, pp;
            do {
                var step = steps[type];
                do {
                    p += step;
                } while (!points[p]);

                pp = points[p];
                if (pp !== 5 && pp !== 10) {
                    // set new direction
                    type = pp;
                    // delete mark
                    points[p] = 0;
                } else { // type is 5 or 10, ie, a crossing
                    // set new direction
                    type = pp & ((0x33 * type) >> 4);
                    // set new type for "future hit"
                    points[p] &= (type >> 2 | type << 2);
                }

                coords.push(p % width1);
                coords.push((p / width1) | 0);
                --count;
            } while (p0 !== p);
            outlines.push(coords);
            --i;
        }

        var drawOutline = function(c) {
            c.save();
            // the path shall be painted in [0..1]x[0..1] space
            c.scale(1 / width, -1 / height);
            c.translate(0, -height);
            c.beginPath();
            for (var i = 0, ii = outlines.length; i < ii; i++) {
                var o = outlines[i];
                c.moveTo(o[0], o[1]);
                for (var j = 2, jj = o.length; j < jj; j += 2) {
                    c.lineTo(o[j], o[j+1]);
                }
            }
            c.fill();
            c.beginPath();
            c.restore();
        };

        return drawOutline;
    }

    var CanvasExtraState = (function CanvasExtraStateClosure() {
        function CanvasExtraState(old) {
            // Are soft masks and alpha values shapes or opacities?
            this.alphaIsShape = false;
            this.fontSize = 0;
            this.fontSizeScale = 1;
            this.textMatrix = IDENTITY_MATRIX;
            this.textMatrixScale = 1;
            this.fontMatrix = FONT_IDENTITY_MATRIX;
            this.leading = 0;
            // Current point (in user coordinates)
            this.x = 0;
            this.y = 0;
            // Start of text line (in text coordinates)
            this.lineX = 0;
            this.lineY = 0;
            // Character and word spacing
            this.charSpacing = 0;
            this.wordSpacing = 0;
            this.textHScale = 1;
            this.textRenderingMode = TextRenderingMode.FILL;
            this.textRise = 0;
            // Default fore and background colors
            this.fillColor = '#000000';
            this.strokeColor = '#000000';
            this.patternFill = false;
            // Note: fill alpha applies to all non-stroking operations
            this.fillAlpha = 1;
            this.strokeAlpha = 1;
            this.lineWidth = 1;
            this.activeSMask = null; // nonclonable field (see the save method below)

            this.old = old;
        }

        CanvasExtraState.prototype = {
            clone: function CanvasExtraState_clone() {
                return Object.create(this);
            },
            setCurrentPoint: function CanvasExtraState_setCurrentPoint(x, y) {
                this.x = x;
                this.y = y;
            }
        };
        return CanvasExtraState;
    })();

    var CanvasGraphics = (function CanvasGraphicsClosure() {
        // Defines the time the executeOperatorList is going to be executing
        // before it stops and shedules a continue of execution.
        var EXECUTION_TIME = 15;
        // Defines the number of steps before checking the execution time
        var EXECUTION_STEPS = 10;

        function CanvasGraphics(canvasCtx, commonObjs, objs, imageLayer) {
            this.ctx = canvasCtx;
            this.current = new CanvasExtraState();
            this.stateStack = [];
            this.pendingClip = null;
            this.pendingEOFill = false;
            this.res = null;
            this.xobjs = null;
            this.commonObjs = commonObjs;
            this.objs = objs;
            this.imageLayer = imageLayer;
            this.groupStack = [];
            this.processingType3 = null;
            // Patterns are painted relative to the initial page/form transform, see pdf
            // spec 8.7.2 NOTE 1.
            this.baseTransform = null;
            this.baseTransformStack = [];
            this.groupLevel = 0;
            this.smaskStack = [];
            this.smaskCounter = 0;
            this.tempSMask = null;
            if (canvasCtx) {
                addContextCurrentTransform(canvasCtx);
            }
            this.cachedGetSinglePixelWidth = null;
        }

        function putBinaryImageData(ctx, imgData) {
            if (typeof ImageData !== 'undefined' && imgData instanceof ImageData) {
                ctx.putImageData(imgData, 0, 0);
                return;
            }

            // Put the image data to the canvas in chunks, rather than putting the
            // whole image at once.  This saves JS memory, because the ImageData object
            // is smaller. It also possibly saves C++ memory within the implementation
            // of putImageData(). (E.g. in Firefox we make two short-lived copies of
            // the data passed to putImageData()). |n| shouldn't be too small, however,
            // because too many putImageData() calls will slow things down.
            //
            // Note: as written, if the last chunk is partial, the putImageData() call
            // will (conceptually) put pixels past the bounds of the canvas.  But
            // that's ok; any such pixels are ignored.

            var height = imgData.height, width = imgData.width;
            var partialChunkHeight = height % FULL_CHUNK_HEIGHT;
            var fullChunks = (height - partialChunkHeight) / FULL_CHUNK_HEIGHT;
            var totalChunks = partialChunkHeight === 0 ? fullChunks : fullChunks + 1;

            var chunkImgData = ctx.createImageData(width, FULL_CHUNK_HEIGHT);
            var srcPos = 0, destPos;
            var src = imgData.data;
            var dest = chunkImgData.data;
            var i, j, thisChunkHeight, elemsInThisChunk;

            // There are multiple forms in which the pixel data can be passed, and
            // imgData.kind tells us which one this is.
            if (imgData.kind === ImageKind.GRAYSCALE_1BPP) {
                // Grayscale, 1 bit per pixel (i.e. black-and-white).
                var srcLength = src.byteLength;
                var dest32 = PDFJS.hasCanvasTypedArrays ? new Uint32Array(dest.buffer) :
                    new Uint32ArrayView(dest);
                var dest32DataLength = dest32.length;
                var fullSrcDiff = (width + 7) >> 3;
                var white = 0xFFFFFFFF;
                var black = (PDFJS.isLittleEndian || !PDFJS.hasCanvasTypedArrays) ?
                    0xFF000000 : 0x000000FF;
                for (i = 0; i < totalChunks; i++) {
                    thisChunkHeight =
                        (i < fullChunks) ? FULL_CHUNK_HEIGHT : partialChunkHeight;
                    destPos = 0;
                    for (j = 0; j < thisChunkHeight; j++) {
                        var srcDiff = srcLength - srcPos;
                        var k = 0;
                        var kEnd = (srcDiff > fullSrcDiff) ? width : srcDiff * 8 - 7;
                        var kEndUnrolled = kEnd & ~7;
                        var mask = 0;
                        var srcByte = 0;
                        for (; k < kEndUnrolled; k += 8) {
                            srcByte = src[srcPos++];
                            dest32[destPos++] = (srcByte & 128) ? white : black;
                            dest32[destPos++] = (srcByte & 64) ? white : black;
                            dest32[destPos++] = (srcByte & 32) ? white : black;
                            dest32[destPos++] = (srcByte & 16) ? white : black;
                            dest32[destPos++] = (srcByte & 8) ? white : black;
                            dest32[destPos++] = (srcByte & 4) ? white : black;
                            dest32[destPos++] = (srcByte & 2) ? white : black;
                            dest32[destPos++] = (srcByte & 1) ? white : black;
                        }
                        for (; k < kEnd; k++) {
                            if (mask === 0) {
                                srcByte = src[srcPos++];
                                mask = 128;
                            }

                            dest32[destPos++] = (srcByte & mask) ? white : black;
                            mask >>= 1;
                        }
                    }
                    // We ran out of input. Make all remaining pixels transparent.
                    while (destPos < dest32DataLength) {
                        dest32[destPos++] = 0;
                    }

                    ctx.putImageData(chunkImgData, 0, i * FULL_CHUNK_HEIGHT);
                }
            } else if (imgData.kind === ImageKind.RGBA_32BPP) {
                // RGBA, 32-bits per pixel.

                j = 0;
                elemsInThisChunk = width * FULL_CHUNK_HEIGHT * 4;
                for (i = 0; i < fullChunks; i++) {
                    dest.set(src.subarray(srcPos, srcPos + elemsInThisChunk));
                    srcPos += elemsInThisChunk;

                    ctx.putImageData(chunkImgData, 0, j);
                    j += FULL_CHUNK_HEIGHT;
                }
                if (i < totalChunks) {
                    elemsInThisChunk = width * partialChunkHeight * 4;
                    dest.set(src.subarray(srcPos, srcPos + elemsInThisChunk));
                    ctx.putImageData(chunkImgData, 0, j);
                }

            } else if (imgData.kind === ImageKind.RGB_24BPP) {
                // RGB, 24-bits per pixel.
                thisChunkHeight = FULL_CHUNK_HEIGHT;
                elemsInThisChunk = width * thisChunkHeight;
                for (i = 0; i < totalChunks; i++) {
                    if (i >= fullChunks) {
                        thisChunkHeight = partialChunkHeight;
                        elemsInThisChunk = width * thisChunkHeight;
                    }

                    destPos = 0;
                    for (j = elemsInThisChunk; j--;) {
                        dest[destPos++] = src[srcPos++];
                        dest[destPos++] = src[srcPos++];
                        dest[destPos++] = src[srcPos++];
                        dest[destPos++] = 255;
                    }
                    ctx.putImageData(chunkImgData, 0, i * FULL_CHUNK_HEIGHT);
                }
            } else {
                error('bad image kind: ' + imgData.kind);
            }
        }

        function putBinaryImageMask(ctx, imgData) {
            var height = imgData.height, width = imgData.width;
            var partialChunkHeight = height % FULL_CHUNK_HEIGHT;
            var fullChunks = (height - partialChunkHeight) / FULL_CHUNK_HEIGHT;
            var totalChunks = partialChunkHeight === 0 ? fullChunks : fullChunks + 1;

            var chunkImgData = ctx.createImageData(width, FULL_CHUNK_HEIGHT);
            var srcPos = 0;
            var src = imgData.data;
            var dest = chunkImgData.data;

            for (var i = 0; i < totalChunks; i++) {
                var thisChunkHeight =
                    (i < fullChunks) ? FULL_CHUNK_HEIGHT : partialChunkHeight;

                // Expand the mask so it can be used by the canvas.  Any required
                // inversion has already been handled.
                var destPos = 3; // alpha component offset
                for (var j = 0; j < thisChunkHeight; j++) {
                    var mask = 0;
                    for (var k = 0; k < width; k++) {
                        if (!mask) {
                            var elem = src[srcPos++];
                            mask = 128;
                        }
                        dest[destPos] = (elem & mask) ? 0 : 255;
                        destPos += 4;
                        mask >>= 1;
                    }
                }
                ctx.putImageData(chunkImgData, 0, i * FULL_CHUNK_HEIGHT);
            }
        }

        function copyCtxState(sourceCtx, destCtx) {
            var properties = ['strokeStyle', 'fillStyle', 'fillRule', 'globalAlpha',
                'lineWidth', 'lineCap', 'lineJoin', 'miterLimit',
                'globalCompositeOperation', 'font'];
            for (var i = 0, ii = properties.length; i < ii; i++) {
                var property = properties[i];
                if (sourceCtx[property] !== undefined) {
                    destCtx[property] = sourceCtx[property];
                }
            }
            if (sourceCtx.setLineDash !== undefined) {
                destCtx.setLineDash(sourceCtx.getLineDash());
                destCtx.lineDashOffset =  sourceCtx.lineDashOffset;
            } else if (sourceCtx.mozDashOffset !== undefined) {
                destCtx.mozDash = sourceCtx.mozDash;
                destCtx.mozDashOffset = sourceCtx.mozDashOffset;
            }
        }

        function composeSMaskBackdrop(bytes, r0, g0, b0) {
            var length = bytes.length;
            for (var i = 3; i < length; i += 4) {
                var alpha = bytes[i];
                if (alpha === 0) {
                    bytes[i - 3] = r0;
                    bytes[i - 2] = g0;
                    bytes[i - 1] = b0;
                } else if (alpha < 255) {
                    var alpha_ = 255 - alpha;
                    bytes[i - 3] = (bytes[i - 3] * alpha + r0 * alpha_) >> 8;
                    bytes[i - 2] = (bytes[i - 2] * alpha + g0 * alpha_) >> 8;
                    bytes[i - 1] = (bytes[i - 1] * alpha + b0 * alpha_) >> 8;
                }
            }
        }

        function composeSMaskAlpha(maskData, layerData) {
            var length = maskData.length;
            var scale = 1 / 255;
            for (var i = 3; i < length; i += 4) {
                var alpha = maskData[i];
                layerData[i] = (layerData[i] * alpha * scale) | 0;
            }
        }

        function composeSMaskLuminosity(maskData, layerData) {
            var length = maskData.length;
            for (var i = 3; i < length; i += 4) {
                var y = (maskData[i - 3] * 77) +  // * 0.3 / 255 * 0x10000
                    (maskData[i - 2] * 152) + // * 0.59 ....
                    (maskData[i - 1] * 28);   // * 0.11 ....
                layerData[i] = (layerData[i] * y) >> 16;
            }
        }

        function genericComposeSMask(maskCtx, layerCtx, width, height,
                                     subtype, backdrop) {
            var hasBackdrop = !!backdrop;
            var r0 = hasBackdrop ? backdrop[0] : 0;
            var g0 = hasBackdrop ? backdrop[1] : 0;
            var b0 = hasBackdrop ? backdrop[2] : 0;

            var composeFn;
            if (subtype === 'Luminosity') {
                composeFn = composeSMaskLuminosity;
            } else {
                composeFn = composeSMaskAlpha;
            }

            // processing image in chunks to save memory
            var PIXELS_TO_PROCESS = 1048576;
            var chunkSize = Math.min(height, Math.ceil(PIXELS_TO_PROCESS / width));
            for (var row = 0; row < height; row += chunkSize) {
                var chunkHeight = Math.min(chunkSize, height - row);
                var maskData = maskCtx.getImageData(0, row, width, chunkHeight);
                var layerData = layerCtx.getImageData(0, row, width, chunkHeight);

                if (hasBackdrop) {
                    composeSMaskBackdrop(maskData.data, r0, g0, b0);
                }
                composeFn(maskData.data, layerData.data);

                maskCtx.putImageData(layerData, 0, row);
            }
        }

        function composeSMask(ctx, smask, layerCtx) {
            var mask = smask.canvas;
            var maskCtx = smask.context;

            ctx.setTransform(smask.scaleX, 0, 0, smask.scaleY,
                smask.offsetX, smask.offsetY);

            var backdrop = smask.backdrop || null;
            if (WebGLUtils.isEnabled) {
                var composed = WebGLUtils.composeSMask(layerCtx.canvas, mask,
                    {subtype: smask.subtype, backdrop: backdrop});
                ctx.setTransform(1, 0, 0, 1, 0, 0);
                ctx.drawImage(composed, smask.offsetX, smask.offsetY);
                return;
            }
            genericComposeSMask(maskCtx, layerCtx, mask.width, mask.height,
                smask.subtype, backdrop);
            ctx.drawImage(mask, 0, 0);
        }

        var LINE_CAP_STYLES = ['butt', 'round', 'square'];
        var LINE_JOIN_STYLES = ['miter', 'round', 'bevel'];
        var NORMAL_CLIP = {};
        var EO_CLIP = {};

        CanvasGraphics.prototype = {

            beginDrawing: function CanvasGraphics_beginDrawing(viewport, transparency) {
                // For pdfs that use blend modes we have to clear the canvas else certain
                // blend modes can look wrong since we'd be blending with a white
                // backdrop. The problem with a transparent backdrop though is we then
                // don't get sub pixel anti aliasing on text, so we fill with white if
                // we can.
                var width = this.ctx.canvas.width;
                var height = this.ctx.canvas.height;
                if (transparency) {
                    this.ctx.clearRect(0, 0, width, height);
                } else {
                    this.ctx.mozOpaque = true;
                    this.ctx.save();
                    this.ctx.fillStyle = 'rgb(255, 255, 255)';
                    this.ctx.fillRect(0, 0, width, height);
                    this.ctx.restore();
                }

                var transform = viewport.transform;

                this.ctx.save();
                this.ctx.transform.apply(this.ctx, transform);

                this.baseTransform = this.ctx.mozCurrentTransform.slice();

                if (this.imageLayer) {
                    this.imageLayer.beginLayout();
                }
            },

            executeOperatorList: function CanvasGraphics_executeOperatorList(
                operatorList,
                executionStartIdx, continueCallback,
                stepper) {
                var argsArray = operatorList.argsArray;
                var fnArray = operatorList.fnArray;
                var i = executionStartIdx || 0;
                var argsArrayLen = argsArray.length;

                // Sometimes the OperatorList to execute is empty.
                if (argsArrayLen === i) {
                    return i;
                }

                var chunkOperations = (argsArrayLen - i > EXECUTION_STEPS &&
                    typeof continueCallback === 'function');
                var endTime = chunkOperations ? Date.now() + EXECUTION_TIME : 0;
                var steps = 0;

                var commonObjs = this.commonObjs;
                var objs = this.objs;
                var fnId;

                while (true) {
                    if (stepper !== undefined && i === stepper.nextBreakPoint) {
                        stepper.breakIt(i, continueCallback);
                        return i;
                    }

                    fnId = fnArray[i];

                    if (fnId !== OPS.dependency) {
                        this[fnId].apply(this, argsArray[i]);
                    } else {
                        var deps = argsArray[i];
                        for (var n = 0, nn = deps.length; n < nn; n++) {
                            var depObjId = deps[n];
                            var common = depObjId[0] === 'g' && depObjId[1] === '_';
                            var objsPool = common ? commonObjs : objs;

                            // If the promise isn't resolved yet, add the continueCallback
                            // to the promise and bail out.
                            if (!objsPool.isResolved(depObjId)) {
                                objsPool.get(depObjId, continueCallback);
                                return i;
                            }
                        }
                    }

                    i++;

                    // If the entire operatorList was executed, stop as were done.
                    if (i === argsArrayLen) {
                        return i;
                    }

                    // If the execution took longer then a certain amount of time and
                    // `continueCallback` is specified, interrupt the execution.
                    if (chunkOperations && ++steps > EXECUTION_STEPS) {
                        if (Date.now() > endTime) {
                            continueCallback();
                            return i;
                        }
                        steps = 0;
                    }

                    // If the operatorList isn't executed completely yet OR the execution
                    // time was short enough, do another execution round.
                }
            },

            endDrawing: function CanvasGraphics_endDrawing() {
                this.ctx.restore();
                CachedCanvases.clear();
                WebGLUtils.clear();

                if (this.imageLayer) {
                    this.imageLayer.endLayout();
                }
            },

            // Graphics state
            setLineWidth: function CanvasGraphics_setLineWidth(width) {
                this.current.lineWidth = width;
                this.ctx.lineWidth = width;
            },
            setLineCap: function CanvasGraphics_setLineCap(style) {
                this.ctx.lineCap = LINE_CAP_STYLES[style];
            },
            setLineJoin: function CanvasGraphics_setLineJoin(style) {
                this.ctx.lineJoin = LINE_JOIN_STYLES[style];
            },
            setMiterLimit: function CanvasGraphics_setMiterLimit(limit) {
                this.ctx.miterLimit = limit;
            },
            setDash: function CanvasGraphics_setDash(dashArray, dashPhase) {
                var ctx = this.ctx;
                if (ctx.setLineDash !== undefined) {
                    ctx.setLineDash(dashArray);
                    ctx.lineDashOffset = dashPhase;
                } else {
                    ctx.mozDash = dashArray;
                    ctx.mozDashOffset = dashPhase;
                }
            },
            setRenderingIntent: function CanvasGraphics_setRenderingIntent(intent) {
                // Maybe if we one day fully support color spaces this will be important
                // for now we can ignore.
                // TODO set rendering intent?
            },
            setFlatness: function CanvasGraphics_setFlatness(flatness) {
                // There's no way to control this with canvas, but we can safely ignore.
                // TODO set flatness?
            },
            setGState: function CanvasGraphics_setGState(states) {
                for (var i = 0, ii = states.length; i < ii; i++) {
                    var state = states[i];
                    var key = state[0];
                    var value = state[1];

                    switch (key) {
                        case 'LW':
                            this.setLineWidth(value);
                            break;
                        case 'LC':
                            this.setLineCap(value);
                            break;
                        case 'LJ':
                            this.setLineJoin(value);
                            break;
                        case 'ML':
                            this.setMiterLimit(value);
                            break;
                        case 'D':
                            this.setDash(value[0], value[1]);
                            break;
                        case 'RI':
                            this.setRenderingIntent(value);
                            break;
                        case 'FL':
                            this.setFlatness(value);
                            break;
                        case 'Font':
                            this.setFont(value[0], value[1]);
                            break;
                        case 'CA':
                            this.current.strokeAlpha = state[1];
                            break;
                        case 'ca':
                            this.current.fillAlpha = state[1];
                            this.ctx.globalAlpha = state[1];
                            break;
                        case 'BM':
                            if (value && value.name && (value.name !== 'Normal')) {
                                var mode = value.name.replace(/([A-Z])/g,
                                    function(c) {
                                        return '-' + c.toLowerCase();
                                    }
                                ).substring(1);
                                this.ctx.globalCompositeOperation = mode;
                                if (this.ctx.globalCompositeOperation !== mode) {
                                    warn('globalCompositeOperation "' + mode +
                                        '" is not supported');
                                }
                            } else {
                                this.ctx.globalCompositeOperation = 'source-over';
                            }
                            break;
                        case 'SMask':
                            if (this.current.activeSMask) {
                                this.endSMaskGroup();
                            }
                            this.current.activeSMask = value ? this.tempSMask : null;
                            if (this.current.activeSMask) {
                                this.beginSMaskGroup();
                            }
                            this.tempSMask = null;
                            break;
                    }
                }
            },
            beginSMaskGroup: function CanvasGraphics_beginSMaskGroup() {

                var activeSMask = this.current.activeSMask;
                var drawnWidth = activeSMask.canvas.width;
                var drawnHeight = activeSMask.canvas.height;
                var cacheId = 'smaskGroupAt' + this.groupLevel;
                var scratchCanvas = CachedCanvases.getCanvas(
                    cacheId, drawnWidth, drawnHeight, true);

                var currentCtx = this.ctx;
                var currentTransform = currentCtx.mozCurrentTransform;
                this.ctx.save();

                var groupCtx = scratchCanvas.context;
                groupCtx.scale(1 / activeSMask.scaleX, 1 / activeSMask.scaleY);
                groupCtx.translate(-activeSMask.offsetX, -activeSMask.offsetY);
                groupCtx.transform.apply(groupCtx, currentTransform);

                copyCtxState(currentCtx, groupCtx);
                this.ctx = groupCtx;
                this.setGState([
                    ['BM', 'Normal'],
                    ['ca', 1],
                    ['CA', 1]
                ]);
                this.groupStack.push(currentCtx);
                this.groupLevel++;
            },
            endSMaskGroup: function CanvasGraphics_endSMaskGroup() {
                var groupCtx = this.ctx;
                this.groupLevel--;
                this.ctx = this.groupStack.pop();

                composeSMask(this.ctx, this.current.activeSMask, groupCtx);
                this.ctx.restore();
            },
            save: function CanvasGraphics_save() {
                this.ctx.save();
                var old = this.current;
                this.stateStack.push(old);
                this.current = old.clone();
                this.current.activeSMask = null;
            },
            restore: function CanvasGraphics_restore() {
                if (this.stateStack.length !== 0) {
                    if (this.current.activeSMask !== null) {
                        this.endSMaskGroup();
                    }

                    this.current = this.stateStack.pop();
                    this.ctx.restore();

                    this.cachedGetSinglePixelWidth = null;
                }
            },
            transform: function CanvasGraphics_transform(a, b, c, d, e, f) {
                this.ctx.transform(a, b, c, d, e, f);

                this.cachedGetSinglePixelWidth = null;
            },

            // Path
            constructPath: function CanvasGraphics_constructPath(ops, args) {
                var ctx = this.ctx;
                var current = this.current;
                var x = current.x, y = current.y;
                for (var i = 0, j = 0, ii = ops.length; i < ii; i++) {
                    switch (ops[i] | 0) {
                        case OPS.rectangle:
                            x = args[j++];
                            y = args[j++];
                            var width = args[j++];
                            var height = args[j++];
                            if (width === 0) {
                                width = this.getSinglePixelWidth();
                            }
                            if (height === 0) {
                                height = this.getSinglePixelWidth();
                            }
                            var xw = x + width;
                            var yh = y + height;
                            this.ctx.moveTo(x, y);
                            this.ctx.lineTo(xw, y);
                            this.ctx.lineTo(xw, yh);
                            this.ctx.lineTo(x, yh);
                            this.ctx.lineTo(x, y);
                            this.ctx.closePath();
                            break;
                        case OPS.moveTo:
                            x = args[j++];
                            y = args[j++];
                            ctx.moveTo(x, y);
                            break;
                        case OPS.lineTo:
                            x = args[j++];
                            y = args[j++];
                            ctx.lineTo(x, y);
                            break;
                        case OPS.curveTo:
                            x = args[j + 4];
                            y = args[j + 5];
                            ctx.bezierCurveTo(args[j], args[j + 1], args[j + 2], args[j + 3],
                                x, y);
                            j += 6;
                            break;
                        case OPS.curveTo2:
                            ctx.bezierCurveTo(x, y, args[j], args[j + 1],
                                args[j + 2], args[j + 3]);
                            x = args[j + 2];
                            y = args[j + 3];
                            j += 4;
                            break;
                        case OPS.curveTo3:
                            x = args[j + 2];
                            y = args[j + 3];
                            ctx.bezierCurveTo(args[j], args[j + 1], x, y, x, y);
                            j += 4;
                            break;
                        case OPS.closePath:
                            ctx.closePath();
                            break;
                    }
                }
                current.setCurrentPoint(x, y);
            },
            closePath: function CanvasGraphics_closePath() {
                this.ctx.closePath();
            },
            stroke: function CanvasGraphics_stroke(consumePath) {
                consumePath = typeof consumePath !== 'undefined' ? consumePath : true;
                var ctx = this.ctx;
                var strokeColor = this.current.strokeColor;
                // Prevent drawing too thin lines by enforcing a minimum line width.
                ctx.lineWidth = Math.max(this.getSinglePixelWidth() * MIN_WIDTH_FACTOR,
                    this.current.lineWidth);
                // For stroke we want to temporarily change the global alpha to the
                // stroking alpha.
                ctx.globalAlpha = this.current.strokeAlpha;
                if (strokeColor && strokeColor.hasOwnProperty('type') &&
                    strokeColor.type === 'Pattern') {
                    // for patterns, we transform to pattern space, calculate
                    // the pattern, call stroke, and restore to user space
                    ctx.save();
                    ctx.strokeStyle = strokeColor.getPattern(ctx, this);
                    ctx.stroke();
                    ctx.restore();
                } else {
                    ctx.stroke();
                }
                if (consumePath) {
                    this.consumePath();
                }
                // Restore the global alpha to the fill alpha
                ctx.globalAlpha = this.current.fillAlpha;
            },
            closeStroke: function CanvasGraphics_closeStroke() {
                this.closePath();
                this.stroke();
            },
            fill: function CanvasGraphics_fill(consumePath) {
                consumePath = typeof consumePath !== 'undefined' ? consumePath : true;
                var ctx = this.ctx;
                var fillColor = this.current.fillColor;
                var isPatternFill = this.current.patternFill;
                var needRestore = false;

                if (isPatternFill) {
                    ctx.save();
                    ctx.fillStyle = fillColor.getPattern(ctx, this);
                    needRestore = true;
                }

                if (this.pendingEOFill) {
                    if (ctx.mozFillRule !== undefined) {
                        ctx.mozFillRule = 'evenodd';
                        ctx.fill();
                        ctx.mozFillRule = 'nonzero';
                    } else {
                        try {
                            ctx.fill('evenodd');
                        } catch (ex) {
                            // shouldn't really happen, but browsers might think differently
                            ctx.fill();
                        }
                    }
                    this.pendingEOFill = false;
                } else {
                    ctx.fill();
                }

                if (needRestore) {
                    ctx.restore();
                }
                if (consumePath) {
                    this.consumePath();
                }
            },
            eoFill: function CanvasGraphics_eoFill() {
                this.pendingEOFill = true;
                this.fill();
            },
            fillStroke: function CanvasGraphics_fillStroke() {
                this.fill(false);
                this.stroke(false);

                this.consumePath();
            },
            eoFillStroke: function CanvasGraphics_eoFillStroke() {
                this.pendingEOFill = true;
                this.fillStroke();
            },
            closeFillStroke: function CanvasGraphics_closeFillStroke() {
                this.closePath();
                this.fillStroke();
            },
            closeEOFillStroke: function CanvasGraphics_closeEOFillStroke() {
                this.pendingEOFill = true;
                this.closePath();
                this.fillStroke();
            },
            endPath: function CanvasGraphics_endPath() {
                this.consumePath();
            },

            // Clipping
            clip: function CanvasGraphics_clip() {
                this.pendingClip = NORMAL_CLIP;
            },
            eoClip: function CanvasGraphics_eoClip() {
                this.pendingClip = EO_CLIP;
            },

            // Text
            beginText: function CanvasGraphics_beginText() {
                this.current.textMatrix = IDENTITY_MATRIX;
                this.current.textMatrixScale = 1;
                this.current.x = this.current.lineX = 0;
                this.current.y = this.current.lineY = 0;
            },
            endText: function CanvasGraphics_endText() {
                var paths = this.pendingTextPaths;
                var ctx = this.ctx;
                if (paths === undefined) {
                    ctx.beginPath();
                    return;
                }

                ctx.save();
                ctx.beginPath();
                for (var i = 0; i < paths.length; i++) {
                    var path = paths[i];
                    ctx.setTransform.apply(ctx, path.transform);
                    ctx.translate(path.x, path.y);
                    path.addToPath(ctx, path.fontSize);
                }
                ctx.restore();
                ctx.clip();
                ctx.beginPath();
                delete this.pendingTextPaths;
            },
            setCharSpacing: function CanvasGraphics_setCharSpacing(spacing) {
                this.current.charSpacing = spacing;
            },
            setWordSpacing: function CanvasGraphics_setWordSpacing(spacing) {
                this.current.wordSpacing = spacing;
            },
            setHScale: function CanvasGraphics_setHScale(scale) {
                this.current.textHScale = scale / 100;
            },
            setLeading: function CanvasGraphics_setLeading(leading) {
                this.current.leading = -leading;
            },
            setFont: function CanvasGraphics_setFont(fontRefName, size) {
                var fontObj = this.commonObjs.get(fontRefName);
                var current = this.current;

                if (!fontObj) {
                    error('Can\'t find font for ' + fontRefName);
                }

                current.fontMatrix = (fontObj.fontMatrix ?
                    fontObj.fontMatrix : FONT_IDENTITY_MATRIX);

                // A valid matrix needs all main diagonal elements to be non-zero
                // This also ensures we bypass FF bugzilla bug #719844.
                if (current.fontMatrix[0] === 0 ||
                    current.fontMatrix[3] === 0) {
                    warn('Invalid font matrix for font ' + fontRefName);
                }

                // The spec for Tf (setFont) says that 'size' specifies the font 'scale',
                // and in some docs this can be negative (inverted x-y axes).
                if (size < 0) {
                    size = -size;
                    current.fontDirection = -1;
                } else {
                    current.fontDirection = 1;
                }

                this.current.font = fontObj;
                this.current.fontSize = size;

                if (fontObj.isType3Font) {
                    return; // we don't need ctx.font for Type3 fonts
                }

                var name = fontObj.loadedName || 'sans-serif';
                var bold = fontObj.black ? (fontObj.bold ? 'bolder' : 'bold') :
                    (fontObj.bold ? 'bold' : 'normal');

                var italic = fontObj.italic ? 'italic' : 'normal';
                var typeface = '"' + name + '", ' + fontObj.fallbackName;

                // Some font backends cannot handle fonts below certain size.
                // Keeping the font at minimal size and using the fontSizeScale to change
                // the current transformation matrix before the fillText/strokeText.
                // See https://bugzilla.mozilla.org/show_bug.cgi?id=726227
                var browserFontSize = size < MIN_FONT_SIZE ? MIN_FONT_SIZE :
                    size > MAX_FONT_SIZE ? MAX_FONT_SIZE : size;
                this.current.fontSizeScale = size / browserFontSize;

                var rule = italic + ' ' + bold + ' ' + browserFontSize + 'px ' + typeface;
                this.ctx.font = rule;
            },
            setTextRenderingMode: function CanvasGraphics_setTextRenderingMode(mode) {
                this.current.textRenderingMode = mode;
            },
            setTextRise: function CanvasGraphics_setTextRise(rise) {
                this.current.textRise = rise;
            },
            moveText: function CanvasGraphics_moveText(x, y) {
                this.current.x = this.current.lineX += x;
                this.current.y = this.current.lineY += y;
            },
            setLeadingMoveText: function CanvasGraphics_setLeadingMoveText(x, y) {
                this.setLeading(-y);
                this.moveText(x, y);
            },
            setTextMatrix: function CanvasGraphics_setTextMatrix(a, b, c, d, e, f) {
                this.current.textMatrix = [a, b, c, d, e, f];
                this.current.textMatrixScale = Math.sqrt(a * a + b * b);

                this.current.x = this.current.lineX = 0;
                this.current.y = this.current.lineY = 0;
            },
            nextLine: function CanvasGraphics_nextLine() {
                this.moveText(0, this.current.leading);
            },

            paintChar: function CanvasGraphics_paintChar(character, x, y) {
                var ctx = this.ctx;
                var current = this.current;
                var font = current.font;
                var textRenderingMode = current.textRenderingMode;
                var fontSize = current.fontSize / current.fontSizeScale;
                var fillStrokeMode = textRenderingMode &
                    TextRenderingMode.FILL_STROKE_MASK;
                var isAddToPathSet = !!(textRenderingMode &
                    TextRenderingMode.ADD_TO_PATH_FLAG);

                var addToPath;
                if (font.disableFontFace || isAddToPathSet) {
                    addToPath = font.getPathGenerator(this.commonObjs, character);
                }

                if (font.disableFontFace) {
                    ctx.save();
                    ctx.translate(x, y);
                    ctx.beginPath();
                    addToPath(ctx, fontSize);
                    if (fillStrokeMode === TextRenderingMode.FILL ||
                        fillStrokeMode === TextRenderingMode.FILL_STROKE) {
                        ctx.fill();
                    }
                    if (fillStrokeMode === TextRenderingMode.STROKE ||
                        fillStrokeMode === TextRenderingMode.FILL_STROKE) {
                        ctx.stroke();
                    }
                    ctx.restore();
                } else {
                    if (fillStrokeMode === TextRenderingMode.FILL ||
                        fillStrokeMode === TextRenderingMode.FILL_STROKE) {
                        ctx.fillText(character, x, y);
                    }
                    if (fillStrokeMode === TextRenderingMode.STROKE ||
                        fillStrokeMode === TextRenderingMode.FILL_STROKE) {
                        ctx.strokeText(character, x, y);
                    }
                }

                if (isAddToPathSet) {
                    var paths = this.pendingTextPaths || (this.pendingTextPaths = []);
                    paths.push({
                        transform: ctx.mozCurrentTransform,
                        x: x,
                        y: y,
                        fontSize: fontSize,
                        addToPath: addToPath
                    });
                }
            },

            get isFontSubpixelAAEnabled() {
                // Checks if anti-aliasing is enabled when scaled text is painted.
                // On Windows GDI scaled fonts looks bad.
                var ctx = document.createElement('canvas').getContext('2d');
                ctx.scale(1.5, 1);
                ctx.fillText('I', 0, 10);
                var data = ctx.getImageData(0, 0, 10, 10).data;
                var enabled = false;
                for (var i = 3; i < data.length; i += 4) {
                    if (data[i] > 0 && data[i] < 255) {
                        enabled = true;
                        break;
                    }
                }
                return shadow(this, 'isFontSubpixelAAEnabled', enabled);
            },

            showText: function CanvasGraphics_showText(glyphs) {
                var current = this.current;
                var font = current.font;
                if (font.isType3Font) {
                    return this.showType3Text(glyphs);
                }

                var fontSize = current.fontSize;
                if (fontSize === 0) {
                    return;
                }

                var ctx = this.ctx;
                var fontSizeScale = current.fontSizeScale;
                var charSpacing = current.charSpacing;
                var wordSpacing = current.wordSpacing;
                var fontDirection = current.fontDirection;
                var textHScale = current.textHScale * fontDirection;
                var glyphsLength = glyphs.length;
                var vertical = font.vertical;
                var defaultVMetrics = font.defaultVMetrics;
                var widthAdvanceScale = fontSize * current.fontMatrix[0];

                var simpleFillText =
                    current.textRenderingMode === TextRenderingMode.FILL &&
                    !font.disableFontFace;

                ctx.save();
                ctx.transform.apply(ctx, current.textMatrix);
                ctx.translate(current.x, current.y + current.textRise);

                if (fontDirection > 0) {
                    ctx.scale(textHScale, -1);
                } else {
                    ctx.scale(textHScale, 1);
                }

                var lineWidth = current.lineWidth;
                var scale = current.textMatrixScale;
                if (scale === 0 || lineWidth === 0) {
                    var fillStrokeMode = current.textRenderingMode &
                        TextRenderingMode.FILL_STROKE_MASK;
                    if (fillStrokeMode === TextRenderingMode.STROKE ||
                        fillStrokeMode === TextRenderingMode.FILL_STROKE) {
                        this.cachedGetSinglePixelWidth = null;
                        lineWidth = this.getSinglePixelWidth() * MIN_WIDTH_FACTOR;
                    }
                } else {
                    lineWidth /= scale;
                }

                if (fontSizeScale !== 1.0) {
                    ctx.scale(fontSizeScale, fontSizeScale);
                    lineWidth /= fontSizeScale;
                }

                ctx.lineWidth = lineWidth;

                var x = 0, i;
                for (i = 0; i < glyphsLength; ++i) {
                    var glyph = glyphs[i];
                    if (glyph === null) {
                        // word break
                        x += fontDirection * wordSpacing;
                        continue;
                    } else if (isNum(glyph)) {
                        x += -glyph * fontSize * 0.001;
                        continue;
                    }

                    var restoreNeeded = false;
                    var character = glyph.fontChar;
                    var accent = glyph.accent;
                    var scaledX, scaledY, scaledAccentX, scaledAccentY;
                    var width = glyph.width;
                    if (vertical) {
                        var vmetric, vx, vy;
                        vmetric = glyph.vmetric || defaultVMetrics;
                        vx = glyph.vmetric ? vmetric[1] : width * 0.5;
                        vx = -vx * widthAdvanceScale;
                        vy = vmetric[2] * widthAdvanceScale;

                        width = vmetric ? -vmetric[0] : width;
                        scaledX = vx / fontSizeScale;
                        scaledY = (x + vy) / fontSizeScale;
                    } else {
                        scaledX = x / fontSizeScale;
                        scaledY = 0;
                    }

                    if (font.remeasure && width > 0 && this.isFontSubpixelAAEnabled) {
                        // some standard fonts may not have the exact width, trying to
                        // rescale per character
                        var measuredWidth = ctx.measureText(character).width * 1000 /
                            fontSize * fontSizeScale;
                        var characterScaleX = width / measuredWidth;
                        restoreNeeded = true;
                        ctx.save();
                        ctx.scale(characterScaleX, 1);
                        scaledX /= characterScaleX;
                    }

                    if (simpleFillText && !accent) {
                        // common case
                        ctx.fillText(character, scaledX, scaledY);
                    } else {
                        this.paintChar(character, scaledX, scaledY);
                        if (accent) {
                            scaledAccentX = scaledX + accent.offset.x / fontSizeScale;
                            scaledAccentY = scaledY - accent.offset.y / fontSizeScale;
                            this.paintChar(accent.fontChar, scaledAccentX, scaledAccentY);
                        }
                    }

                    var charWidth = width * widthAdvanceScale + charSpacing * fontDirection;
                    x += charWidth;

                    if (restoreNeeded) {
                        ctx.restore();
                    }
                }
                if (vertical) {
                    current.y -= x * textHScale;
                } else {
                    current.x += x * textHScale;
                }
                ctx.restore();
            },

            showType3Text: function CanvasGraphics_showType3Text(glyphs) {
                // Type3 fonts - each glyph is a "mini-PDF"
                var ctx = this.ctx;
                var current = this.current;
                var font = current.font;
                var fontSize = current.fontSize;
                var fontDirection = current.fontDirection;
                var charSpacing = current.charSpacing;
                var wordSpacing = current.wordSpacing;
                var textHScale = current.textHScale * fontDirection;
                var fontMatrix = current.fontMatrix || FONT_IDENTITY_MATRIX;
                var glyphsLength = glyphs.length;
                var isTextInvisible =
                    current.textRenderingMode === TextRenderingMode.INVISIBLE;
                var i, glyph, width;

                if (isTextInvisible || fontSize === 0) {
                    return;
                }

                ctx.save();
                ctx.transform.apply(ctx, current.textMatrix);
                ctx.translate(current.x, current.y);

                ctx.scale(textHScale, fontDirection);

                for (i = 0; i < glyphsLength; ++i) {
                    glyph = glyphs[i];
                    if (glyph === null) {
                        // word break
                        this.ctx.translate(wordSpacing, 0);
                        current.x += wordSpacing * textHScale;
                        continue;
                    } else if (isNum(glyph)) {
                        var spacingLength = -glyph * 0.001 * fontSize;
                        this.ctx.translate(spacingLength, 0);
                        current.x += spacingLength * textHScale;
                        continue;
                    }

                    var operatorList = font.charProcOperatorList[glyph.operatorListId];
                    if (!operatorList) {
                        warn('Type3 character \"' + glyph.operatorListId +
                            '\" is not available');
                        continue;
                    }
                    this.processingType3 = glyph;
                    this.save();
                    ctx.scale(fontSize, fontSize);
                    ctx.transform.apply(ctx, fontMatrix);
                    this.executeOperatorList(operatorList);
                    this.restore();

                    var transformed = Util.applyTransform([glyph.width, 0], fontMatrix);
                    width = transformed[0] * fontSize + charSpacing;

                    ctx.translate(width, 0);
                    current.x += width * textHScale;
                }
                ctx.restore();
                this.processingType3 = null;
            },

            // Type3 fonts
            setCharWidth: function CanvasGraphics_setCharWidth(xWidth, yWidth) {
                // We can safely ignore this since the width should be the same
                // as the width in the Widths array.
            },
            setCharWidthAndBounds: function CanvasGraphics_setCharWidthAndBounds(xWidth,
                                                                                 yWidth,
                                                                                 llx,
                                                                                 lly,
                                                                                 urx,
                                                                                 ury) {
                // TODO According to the spec we're also suppose to ignore any operators
                // that set color or include images while processing this type3 font.
                this.ctx.rect(llx, lly, urx - llx, ury - lly);
                this.clip();
                this.endPath();
            },

            // Color
            getColorN_Pattern: function CanvasGraphics_getColorN_Pattern(IR) {
                var pattern;
                if (IR[0] === 'TilingPattern') {
                    var color = IR[1];
                    pattern = new TilingPattern(IR, color, this.ctx, this.objs,
                        this.commonObjs, this.baseTransform);
                } else {
                    pattern = getShadingPatternFromIR(IR);
                }
                return pattern;
            },
            setStrokeColorN: function CanvasGraphics_setStrokeColorN(/*...*/) {
                this.current.strokeColor = this.getColorN_Pattern(arguments);
            },
            setFillColorN: function CanvasGraphics_setFillColorN(/*...*/) {
                this.current.fillColor = this.getColorN_Pattern(arguments);
                this.current.patternFill = true;
            },
            setStrokeRGBColor: function CanvasGraphics_setStrokeRGBColor(r, g, b) {
                var color = Util.makeCssRgb(r, g, b);
                this.ctx.strokeStyle = color;
                this.current.strokeColor = color;
            },
            setFillRGBColor: function CanvasGraphics_setFillRGBColor(r, g, b) {
                var color = Util.makeCssRgb(r, g, b);
                this.ctx.fillStyle = color;
                this.current.fillColor = color;
                this.current.patternFill = false;
            },

            shadingFill: function CanvasGraphics_shadingFill(patternIR) {
                var ctx = this.ctx;

                this.save();
                var pattern = getShadingPatternFromIR(patternIR);
                ctx.fillStyle = pattern.getPattern(ctx, this, true);

                var inv = ctx.mozCurrentTransformInverse;
                if (inv) {
                    var canvas = ctx.canvas;
                    var width = canvas.width;
                    var height = canvas.height;

                    var bl = Util.applyTransform([0, 0], inv);
                    var br = Util.applyTransform([0, height], inv);
                    var ul = Util.applyTransform([width, 0], inv);
                    var ur = Util.applyTransform([width, height], inv);

                    var x0 = Math.min(bl[0], br[0], ul[0], ur[0]);
                    var y0 = Math.min(bl[1], br[1], ul[1], ur[1]);
                    var x1 = Math.max(bl[0], br[0], ul[0], ur[0]);
                    var y1 = Math.max(bl[1], br[1], ul[1], ur[1]);

                    this.ctx.fillRect(x0, y0, x1 - x0, y1 - y0);
                } else {
                    // HACK to draw the gradient onto an infinite rectangle.
                    // PDF gradients are drawn across the entire image while
                    // Canvas only allows gradients to be drawn in a rectangle
                    // The following bug should allow us to remove this.
                    // https://bugzilla.mozilla.org/show_bug.cgi?id=664884

                    this.ctx.fillRect(-1e10, -1e10, 2e10, 2e10);
                }

                this.restore();
            },

            // Images
            beginInlineImage: function CanvasGraphics_beginInlineImage() {
                error('Should not call beginInlineImage');
            },
            beginImageData: function CanvasGraphics_beginImageData() {
                error('Should not call beginImageData');
            },

            paintFormXObjectBegin: function CanvasGraphics_paintFormXObjectBegin(matrix,
                                                                                 bbox) {
                this.save();
                this.baseTransformStack.push(this.baseTransform);

                if (isArray(matrix) && 6 === matrix.length) {
                    this.transform.apply(this, matrix);
                }

                this.baseTransform = this.ctx.mozCurrentTransform;

                if (isArray(bbox) && 4 === bbox.length) {
                    var width = bbox[2] - bbox[0];
                    var height = bbox[3] - bbox[1];
                    this.ctx.rect(bbox[0], bbox[1], width, height);
                    this.clip();
                    this.endPath();
                }
            },

            paintFormXObjectEnd: function CanvasGraphics_paintFormXObjectEnd() {
                this.restore();
                this.baseTransform = this.baseTransformStack.pop();
            },

            beginGroup: function CanvasGraphics_beginGroup(group) {
                this.save();
                var currentCtx = this.ctx;
                // TODO non-isolated groups - according to Rik at adobe non-isolated
                // group results aren't usually that different and they even have tools
                // that ignore this setting. Notes from Rik on implmenting:
                // - When you encounter an transparency group, create a new canvas with
                // the dimensions of the bbox
                // - copy the content from the previous canvas to the new canvas
                // - draw as usual
                // - remove the backdrop alpha:
                // alphaNew = 1 - (1 - alpha)/(1 - alphaBackdrop) with 'alpha' the alpha
                // value of your transparency group and 'alphaBackdrop' the alpha of the
                // backdrop
                // - remove background color:
                // colorNew = color - alphaNew *colorBackdrop /(1 - alphaNew)
                if (!group.isolated) {
                    info('TODO: Support non-isolated groups.');
                }

                // TODO knockout - supposedly possible with the clever use of compositing
                // modes.
                if (group.knockout) {
                    warn('Knockout groups not supported.');
                }

                var currentTransform = currentCtx.mozCurrentTransform;
                if (group.matrix) {
                    currentCtx.transform.apply(currentCtx, group.matrix);
                }
                assert(group.bbox, 'Bounding box is required.');

                // Based on the current transform figure out how big the bounding box
                // will actually be.
                var bounds = Util.getAxialAlignedBoundingBox(
                    group.bbox,
                    currentCtx.mozCurrentTransform);
                // Clip the bounding box to the current canvas.
                var canvasBounds = [0,
                    0,
                    currentCtx.canvas.width,
                    currentCtx.canvas.height];
                bounds = Util.intersect(bounds, canvasBounds) || [0, 0, 0, 0];
                // Use ceil in case we're between sizes so we don't create canvas that is
                // too small and make the canvas at least 1x1 pixels.
                var offsetX = Math.floor(bounds[0]);
                var offsetY = Math.floor(bounds[1]);
                var drawnWidth = Math.max(Math.ceil(bounds[2]) - offsetX, 1);
                var drawnHeight = Math.max(Math.ceil(bounds[3]) - offsetY, 1);
                var scaleX = 1, scaleY = 1;
                if (drawnWidth > MAX_GROUP_SIZE) {
                    scaleX = drawnWidth / MAX_GROUP_SIZE;
                    drawnWidth = MAX_GROUP_SIZE;
                }
                if (drawnHeight > MAX_GROUP_SIZE) {
                    scaleY = drawnHeight / MAX_GROUP_SIZE;
                    drawnHeight = MAX_GROUP_SIZE;
                }

                var cacheId = 'groupAt' + this.groupLevel;
                if (group.smask) {
                    // Using two cache entries is case if masks are used one after another.
                    cacheId +=  '_smask_' + ((this.smaskCounter++) % 2);
                }
                var scratchCanvas = CachedCanvases.getCanvas(
                    cacheId, drawnWidth, drawnHeight, true);
                var groupCtx = scratchCanvas.context;

                // Since we created a new canvas that is just the size of the bounding box
                // we have to translate the group ctx.
                groupCtx.scale(1 / scaleX, 1 / scaleY);
                groupCtx.translate(-offsetX, -offsetY);
                groupCtx.transform.apply(groupCtx, currentTransform);

                if (group.smask) {
                    // Saving state and cached mask to be used in setGState.
                    this.smaskStack.push({
                        canvas: scratchCanvas.canvas,
                        context: groupCtx,
                        offsetX: offsetX,
                        offsetY: offsetY,
                        scaleX: scaleX,
                        scaleY: scaleY,
                        subtype: group.smask.subtype,
                        backdrop: group.smask.backdrop
                    });
                } else {
                    // Setup the current ctx so when the group is popped we draw it at the
                    // right location.
                    currentCtx.setTransform(1, 0, 0, 1, 0, 0);
                    currentCtx.translate(offsetX, offsetY);
                    currentCtx.scale(scaleX, scaleY);
                }
                // The transparency group inherits all off the current graphics state
                // except the blend mode, soft mask, and alpha constants.
                copyCtxState(currentCtx, groupCtx);
                this.ctx = groupCtx;
                this.setGState([
                    ['BM', 'Normal'],
                    ['ca', 1],
                    ['CA', 1]
                ]);
                this.groupStack.push(currentCtx);
                this.groupLevel++;
            },

            endGroup: function CanvasGraphics_endGroup(group) {
                this.groupLevel--;
                var groupCtx = this.ctx;
                this.ctx = this.groupStack.pop();
                // Turn off image smoothing to avoid sub pixel interpolation which can
                // look kind of blurry for some pdfs.
                if (this.ctx.imageSmoothingEnabled !== undefined) {
                    this.ctx.imageSmoothingEnabled = false;
                } else {
                    this.ctx.mozImageSmoothingEnabled = false;
                }
                if (group.smask) {
                    this.tempSMask = this.smaskStack.pop();
                } else {
                    this.ctx.drawImage(groupCtx.canvas, 0, 0);
                }
                this.restore();
            },

            beginAnnotations: function CanvasGraphics_beginAnnotations() {
                this.save();
                this.current = new CanvasExtraState();
            },

            endAnnotations: function CanvasGraphics_endAnnotations() {
                this.restore();
            },

            beginAnnotation: function CanvasGraphics_beginAnnotation(rect, transform,
                                                                     matrix) {
                this.save();

                if (isArray(rect) && 4 === rect.length) {
                    var width = rect[2] - rect[0];
                    var height = rect[3] - rect[1];
                    this.ctx.rect(rect[0], rect[1], width, height);
                    this.clip();
                    this.endPath();
                }

                this.transform.apply(this, transform);
                this.transform.apply(this, matrix);
            },

            endAnnotation: function CanvasGraphics_endAnnotation() {
                this.restore();
            },

            paintJpegXObject: function CanvasGraphics_paintJpegXObject(objId, w, h) {
                var domImage = this.objs.get(objId);
                if (!domImage) {
                    warn('Dependent image isn\'t ready yet');
                    return;
                }

                this.save();

                var ctx = this.ctx;
                // scale the image to the unit square
                ctx.scale(1 / w, -1 / h);

                ctx.drawImage(domImage, 0, 0, domImage.width, domImage.height,
                    0, -h, w, h);
                if (this.imageLayer) {
                    var currentTransform = ctx.mozCurrentTransformInverse;
                    var position = this.getCanvasPosition(0, 0);
                    this.imageLayer.appendImage({
                        objId: objId,
                        left: position[0],
                        top: position[1],
                        width: w / currentTransform[0],
                        height: h / currentTransform[3]
                    });
                }
                this.restore();
            },

            paintImageMaskXObject: function CanvasGraphics_paintImageMaskXObject(img) {
                var ctx = this.ctx;
                var width = img.width, height = img.height;
                var fillColor = this.current.fillColor;
                var isPatternFill = this.current.patternFill;

                var glyph = this.processingType3;

                if (COMPILE_TYPE3_GLYPHS && glyph && glyph.compiled === undefined) {
                    if (width <= MAX_SIZE_TO_COMPILE && height <= MAX_SIZE_TO_COMPILE) {
                        glyph.compiled =
                            compileType3Glyph({data: img.data, width: width, height: height});
                    } else {
                        glyph.compiled = null;
                    }
                }

                if (glyph && glyph.compiled) {
                    glyph.compiled(ctx);
                    return;
                }

                var maskCanvas = CachedCanvases.getCanvas('maskCanvas', width, height);
                var maskCtx = maskCanvas.context;
                maskCtx.save();

                putBinaryImageMask(maskCtx, img);

                maskCtx.globalCompositeOperation = 'source-in';

                maskCtx.fillStyle = isPatternFill ?
                    fillColor.getPattern(maskCtx, this) : fillColor;
                maskCtx.fillRect(0, 0, width, height);

                maskCtx.restore();

                this.paintInlineImageXObject(maskCanvas.canvas);
            },

            paintImageMaskXObjectRepeat:
                function CanvasGraphics_paintImageMaskXObjectRepeat(imgData, scaleX,
                                                                    scaleY, positions) {
                    var width = imgData.width;
                    var height = imgData.height;
                    var fillColor = this.current.fillColor;
                    var isPatternFill = this.current.patternFill;

                    var maskCanvas = CachedCanvases.getCanvas('maskCanvas', width, height);
                    var maskCtx = maskCanvas.context;
                    maskCtx.save();

                    putBinaryImageMask(maskCtx, imgData);

                    maskCtx.globalCompositeOperation = 'source-in';

                    maskCtx.fillStyle = isPatternFill ?
                        fillColor.getPattern(maskCtx, this) : fillColor;
                    maskCtx.fillRect(0, 0, width, height);

                    maskCtx.restore();

                    var ctx = this.ctx;
                    for (var i = 0, ii = positions.length; i < ii; i += 2) {
                        ctx.save();
                        ctx.transform(scaleX, 0, 0, scaleY, positions[i], positions[i + 1]);
                        ctx.scale(1, -1);
                        ctx.drawImage(maskCanvas.canvas, 0, 0, width, height,
                            0, -1, 1, 1);
                        ctx.restore();
                    }
                },

            paintImageMaskXObjectGroup:
                function CanvasGraphics_paintImageMaskXObjectGroup(images) {
                    var ctx = this.ctx;

                    var fillColor = this.current.fillColor;
                    var isPatternFill = this.current.patternFill;
                    for (var i = 0, ii = images.length; i < ii; i++) {
                        var image = images[i];
                        var width = image.width, height = image.height;

                        var maskCanvas = CachedCanvases.getCanvas('maskCanvas', width, height);
                        var maskCtx = maskCanvas.context;
                        maskCtx.save();

                        putBinaryImageMask(maskCtx, image);

                        maskCtx.globalCompositeOperation = 'source-in';

                        maskCtx.fillStyle = isPatternFill ?
                            fillColor.getPattern(maskCtx, this) : fillColor;
                        maskCtx.fillRect(0, 0, width, height);

                        maskCtx.restore();

                        ctx.save();
                        ctx.transform.apply(ctx, image.transform);
                        ctx.scale(1, -1);
                        ctx.drawImage(maskCanvas.canvas, 0, 0, width, height,
                            0, -1, 1, 1);
                        ctx.restore();
                    }
                },

            paintImageXObject: function CanvasGraphics_paintImageXObject(objId) {
                var imgData = this.objs.get(objId);
                if (!imgData) {
                    warn('Dependent image isn\'t ready yet');
                    return;
                }

                this.paintInlineImageXObject(imgData);
            },

            paintImageXObjectRepeat:
                function CanvasGraphics_paintImageXObjectRepeat(objId, scaleX, scaleY,
                                                                positions) {
                    var imgData = this.objs.get(objId);
                    if (!imgData) {
                        warn('Dependent image isn\'t ready yet');
                        return;
                    }

                    var width = imgData.width;
                    var height = imgData.height;
                    var map = [];
                    for (var i = 0, ii = positions.length; i < ii; i += 2) {
                        map.push({transform: [scaleX, 0, 0, scaleY, positions[i],
                                positions[i + 1]], x: 0, y: 0, w: width, h: height});
                    }
                    this.paintInlineImageXObjectGroup(imgData, map);
                },

            paintInlineImageXObject:
                function CanvasGraphics_paintInlineImageXObject(imgData) {
                    var width = imgData.width;
                    var height = imgData.height;
                    var ctx = this.ctx;

                    this.save();
                    // scale the image to the unit square
                    ctx.scale(1 / width, -1 / height);

                    var currentTransform = ctx.mozCurrentTransformInverse;
                    var a = currentTransform[0], b = currentTransform[1];
                    var widthScale = Math.max(Math.sqrt(a * a + b * b), 1);
                    var c = currentTransform[2], d = currentTransform[3];
                    var heightScale = Math.max(Math.sqrt(c * c + d * d), 1);

                    var imgToPaint, tmpCanvas;
                    // instanceof HTMLElement does not work in jsdom node.js module
                    if (imgData instanceof HTMLElement || !imgData.data) {
                        imgToPaint = imgData;
                    } else {
                        tmpCanvas = CachedCanvases.getCanvas('inlineImage', width, height);
                        var tmpCtx = tmpCanvas.context;
                        putBinaryImageData(tmpCtx, imgData);
                        imgToPaint = tmpCanvas.canvas;
                    }

                    var paintWidth = width, paintHeight = height;
                    var tmpCanvasId = 'prescale1';
                    // Vertial or horizontal scaling shall not be more than 2 to not loose the
                    // pixels during drawImage operation, painting on the temporary canvas(es)
                    // that are twice smaller in size
                    while ((widthScale > 2 && paintWidth > 1) ||
                    (heightScale > 2 && paintHeight > 1)) {
                        var newWidth = paintWidth, newHeight = paintHeight;
                        if (widthScale > 2 && paintWidth > 1) {
                            newWidth = Math.ceil(paintWidth / 2);
                            widthScale /= paintWidth / newWidth;
                        }
                        if (heightScale > 2 && paintHeight > 1) {
                            newHeight = Math.ceil(paintHeight / 2);
                            heightScale /= paintHeight / newHeight;
                        }
                        tmpCanvas = CachedCanvases.getCanvas(tmpCanvasId, newWidth, newHeight);
                        tmpCtx = tmpCanvas.context;
                        tmpCtx.clearRect(0, 0, newWidth, newHeight);
                        tmpCtx.drawImage(imgToPaint, 0, 0, paintWidth, paintHeight,
                            0, 0, newWidth, newHeight);
                        imgToPaint = tmpCanvas.canvas;
                        paintWidth = newWidth;
                        paintHeight = newHeight;
                        tmpCanvasId = tmpCanvasId === 'prescale1' ? 'prescale2' : 'prescale1';
                    }
                    ctx.drawImage(imgToPaint, 0, 0, paintWidth, paintHeight,
                        0, -height, width, height);

                    if (this.imageLayer) {
                        var position = this.getCanvasPosition(0, -height);
                        this.imageLayer.appendImage({
                            imgData: imgData,
                            left: position[0],
                            top: position[1],
                            width: width / currentTransform[0],
                            height: height / currentTransform[3]
                        });
                    }
                    this.restore();
                },

            paintInlineImageXObjectGroup:
                function CanvasGraphics_paintInlineImageXObjectGroup(imgData, map) {
                    var ctx = this.ctx;
                    var w = imgData.width;
                    var h = imgData.height;

                    var tmpCanvas = CachedCanvases.getCanvas('inlineImage', w, h);
                    var tmpCtx = tmpCanvas.context;
                    putBinaryImageData(tmpCtx, imgData);

                    for (var i = 0, ii = map.length; i < ii; i++) {
                        var entry = map[i];
                        ctx.save();
                        ctx.transform.apply(ctx, entry.transform);
                        ctx.scale(1, -1);
                        ctx.drawImage(tmpCanvas.canvas, entry.x, entry.y, entry.w, entry.h,
                            0, -1, 1, 1);
                        if (this.imageLayer) {
                            var position = this.getCanvasPosition(entry.x, entry.y);
                            this.imageLayer.appendImage({
                                imgData: imgData,
                                left: position[0],
                                top: position[1],
                                width: w,
                                height: h
                            });
                        }
                        ctx.restore();
                    }
                },

            paintSolidColorImageMask:
                function CanvasGraphics_paintSolidColorImageMask() {
                    this.ctx.fillRect(0, 0, 1, 1);
                },

            // Marked content

            markPoint: function CanvasGraphics_markPoint(tag) {
                // TODO Marked content.
            },
            markPointProps: function CanvasGraphics_markPointProps(tag, properties) {
                // TODO Marked content.
            },
            beginMarkedContent: function CanvasGraphics_beginMarkedContent(tag) {
                // TODO Marked content.
            },
            beginMarkedContentProps: function CanvasGraphics_beginMarkedContentProps(
                tag, properties) {
                // TODO Marked content.
            },
            endMarkedContent: function CanvasGraphics_endMarkedContent() {
                // TODO Marked content.
            },

            // Compatibility

            beginCompat: function CanvasGraphics_beginCompat() {
                // TODO ignore undefined operators (should we do that anyway?)
            },
            endCompat: function CanvasGraphics_endCompat() {
                // TODO stop ignoring undefined operators
            },

            // Helper functions

            consumePath: function CanvasGraphics_consumePath() {
                var ctx = this.ctx;
                if (this.pendingClip) {
                    if (this.pendingClip === EO_CLIP) {
                        if (ctx.mozFillRule !== undefined) {
                            ctx.mozFillRule = 'evenodd';
                            ctx.clip();
                            ctx.mozFillRule = 'nonzero';
                        } else {
                            try {
                                ctx.clip('evenodd');
                            } catch (ex) {
                                // shouldn't really happen, but browsers might think differently
                                ctx.clip();
                            }
                        }
                    } else {
                        ctx.clip();
                    }
                    this.pendingClip = null;
                }
                ctx.beginPath();
            },
            getSinglePixelWidth: function CanvasGraphics_getSinglePixelWidth(scale) {
                if (this.cachedGetSinglePixelWidth === null) {
                    var inverse = this.ctx.mozCurrentTransformInverse;
                    // max of the current horizontal and vertical scale
                    this.cachedGetSinglePixelWidth = Math.sqrt(Math.max(
                        (inverse[0] * inverse[0] + inverse[1] * inverse[1]),
                        (inverse[2] * inverse[2] + inverse[3] * inverse[3])));
                }
                return this.cachedGetSinglePixelWidth;
            },
            getCanvasPosition: function CanvasGraphics_getCanvasPosition(x, y) {
                var transform = this.ctx.mozCurrentTransform;
                return [
                    transform[0] * x + transform[2] * y + transform[4],
                    transform[1] * x + transform[3] * y + transform[5]
                ];
            }
        };

        for (var op in OPS) {
            CanvasGraphics.prototype[OPS[op]] = CanvasGraphics.prototype[op];
        }

        return CanvasGraphics;
    })();


    var WebGLUtils = (function WebGLUtilsClosure() {
        function loadShader(gl, code, shaderType) {
            var shader = gl.createShader(shaderType);
            gl.shaderSource(shader, code);
            gl.compileShader(shader);
            var compiled = gl.getShaderParameter(shader, gl.COMPILE_STATUS);
            if (!compiled) {
                var errorMsg = gl.getShaderInfoLog(shader);
                throw new Error('Error during shader compilation: ' + errorMsg);
            }
            return shader;
        }
        function createVertexShader(gl, code) {
            return loadShader(gl, code, gl.VERTEX_SHADER);
        }
        function createFragmentShader(gl, code) {
            return loadShader(gl, code, gl.FRAGMENT_SHADER);
        }
        function createProgram(gl, shaders) {
            var program = gl.createProgram();
            for (var i = 0, ii = shaders.length; i < ii; ++i) {
                gl.attachShader(program, shaders[i]);
            }
            gl.linkProgram(program);
            var linked = gl.getProgramParameter(program, gl.LINK_STATUS);
            if (!linked) {
                var errorMsg = gl.getProgramInfoLog(program);
                throw new Error('Error during program linking: ' + errorMsg);
            }
            return program;
        }
        function createTexture(gl, image, textureId) {
            gl.activeTexture(textureId);
            var texture = gl.createTexture();
            gl.bindTexture(gl.TEXTURE_2D, texture);

            // Set the parameters so we can render any size image.
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);

            // Upload the image into the texture.
            gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
            return texture;
        }

        var currentGL, currentCanvas;
        function generateGL() {
            if (currentGL) {
                return;
            }
            currentCanvas = document.createElement('canvas');
            currentGL = currentCanvas.getContext('webgl',
                { premultipliedalpha: false });
        }

        var smaskVertexShaderCode = '\
  attribute vec2 a_position;                                    \
  attribute vec2 a_texCoord;                                    \
                                                                \
  uniform vec2 u_resolution;                                    \
                                                                \
  varying vec2 v_texCoord;                                      \
                                                                \
  void main() {                                                 \
    vec2 clipSpace = (a_position / u_resolution) * 2.0 - 1.0;   \
    gl_Position = vec4(clipSpace * vec2(1, -1), 0, 1);          \
                                                                \
    v_texCoord = a_texCoord;                                    \
  }                                                             ';

        var smaskFragmentShaderCode = '\
  precision mediump float;                                      \
                                                                \
  uniform vec4 u_backdrop;                                      \
  uniform int u_subtype;                                        \
  uniform sampler2D u_image;                                    \
  uniform sampler2D u_mask;                                     \
                                                                \
  varying vec2 v_texCoord;                                      \
                                                                \
  void main() {                                                 \
    vec4 imageColor = texture2D(u_image, v_texCoord);           \
    vec4 maskColor = texture2D(u_mask, v_texCoord);             \
    if (u_backdrop.a > 0.0) {                                   \
      maskColor.rgb = maskColor.rgb * maskColor.a +             \
                      u_backdrop.rgb * (1.0 - maskColor.a);     \
    }                                                           \
    float lum;                                                  \
    if (u_subtype == 0) {                                       \
      lum = maskColor.a;                                        \
    } else {                                                    \
      lum = maskColor.r * 0.3 + maskColor.g * 0.59 +            \
            maskColor.b * 0.11;                                 \
    }                                                           \
    imageColor.a *= lum;                                        \
    imageColor.rgb *= imageColor.a;                             \
    gl_FragColor = imageColor;                                  \
  }                                                             ';

        var smaskCache = null;

        function initSmaskGL() {
            var canvas, gl;

            generateGL();
            canvas = currentCanvas;
            currentCanvas = null;
            gl = currentGL;
            currentGL = null;

            // setup a GLSL program
            var vertexShader = createVertexShader(gl, smaskVertexShaderCode);
            var fragmentShader = createFragmentShader(gl, smaskFragmentShaderCode);
            var program = createProgram(gl, [vertexShader, fragmentShader]);
            gl.useProgram(program);

            var cache = {};
            cache.gl = gl;
            cache.canvas = canvas;
            cache.resolutionLocation = gl.getUniformLocation(program, 'u_resolution');
            cache.positionLocation = gl.getAttribLocation(program, 'a_position');
            cache.backdropLocation = gl.getUniformLocation(program, 'u_backdrop');
            cache.subtypeLocation = gl.getUniformLocation(program, 'u_subtype');

            var texCoordLocation = gl.getAttribLocation(program, 'a_texCoord');
            var texLayerLocation = gl.getUniformLocation(program, 'u_image');
            var texMaskLocation = gl.getUniformLocation(program, 'u_mask');

            // provide texture coordinates for the rectangle.
            var texCoordBuffer = gl.createBuffer();
            gl.bindBuffer(gl.ARRAY_BUFFER, texCoordBuffer);
            gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
                0.0,  0.0,
                1.0,  0.0,
                0.0,  1.0,
                0.0,  1.0,
                1.0,  0.0,
                1.0,  1.0]), gl.STATIC_DRAW);
            gl.enableVertexAttribArray(texCoordLocation);
            gl.vertexAttribPointer(texCoordLocation, 2, gl.FLOAT, false, 0, 0);

            gl.uniform1i(texLayerLocation, 0);
            gl.uniform1i(texMaskLocation, 1);

            smaskCache = cache;
        }

        function composeSMask(layer, mask, properties) {
            var width = layer.width, height = layer.height;

            if (!smaskCache) {
                initSmaskGL();
            }
            var cache = smaskCache,canvas = cache.canvas, gl = cache.gl;
            canvas.width = width;
            canvas.height = height;
            gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);
            gl.uniform2f(cache.resolutionLocation, width, height);

            if (properties.backdrop) {
                gl.uniform4f(cache.resolutionLocation, properties.backdrop[0],
                    properties.backdrop[1], properties.backdrop[2], 1);
            } else {
                gl.uniform4f(cache.resolutionLocation, 0, 0, 0, 0);
            }
            gl.uniform1i(cache.subtypeLocation,
                properties.subtype === 'Luminosity' ? 1 : 0);

            // Create a textures
            var texture = createTexture(gl, layer, gl.TEXTURE0);
            var maskTexture = createTexture(gl, mask, gl.TEXTURE1);


            // Create a buffer and put a single clipspace rectangle in
            // it (2 triangles)
            var buffer = gl.createBuffer();
            gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
            gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
                0, 0,
                width, 0,
                0, height,
                0, height,
                width, 0,
                width, height]), gl.STATIC_DRAW);
            gl.enableVertexAttribArray(cache.positionLocation);
            gl.vertexAttribPointer(cache.positionLocation, 2, gl.FLOAT, false, 0, 0);

            // draw
            gl.clearColor(0, 0, 0, 0);
            gl.enable(gl.BLEND);
            gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA);
            gl.clear(gl.COLOR_BUFFER_BIT);

            gl.drawArrays(gl.TRIANGLES, 0, 6);

            gl.flush();

            gl.deleteTexture(texture);
            gl.deleteTexture(maskTexture);
            gl.deleteBuffer(buffer);

            return canvas;
        }

        var figuresVertexShaderCode = '\
  attribute vec2 a_position;                                    \
  attribute vec3 a_color;                                       \
                                                                \
  uniform vec2 u_resolution;                                    \
  uniform vec2 u_scale;                                         \
  uniform vec2 u_offset;                                        \
                                                                \
  varying vec4 v_color;                                         \
                                                                \
  void main() {                                                 \
    vec2 position = (a_position + u_offset) * u_scale;          \
    vec2 clipSpace = (position / u_resolution) * 2.0 - 1.0;     \
    gl_Position = vec4(clipSpace * vec2(1, -1), 0, 1);          \
                                                                \
    v_color = vec4(a_color / 255.0, 1.0);                       \
  }                                                             ';

        var figuresFragmentShaderCode = '\
  precision mediump float;                                      \
                                                                \
  varying vec4 v_color;                                         \
                                                                \
  void main() {                                                 \
    gl_FragColor = v_color;                                     \
  }                                                             ';

        var figuresCache = null;

        function initFiguresGL() {
            var canvas, gl;

            generateGL();
            canvas = currentCanvas;
            currentCanvas = null;
            gl = currentGL;
            currentGL = null;

            // setup a GLSL program
            var vertexShader = createVertexShader(gl, figuresVertexShaderCode);
            var fragmentShader = createFragmentShader(gl, figuresFragmentShaderCode);
            var program = createProgram(gl, [vertexShader, fragmentShader]);
            gl.useProgram(program);

            var cache = {};
            cache.gl = gl;
            cache.canvas = canvas;
            cache.resolutionLocation = gl.getUniformLocation(program, 'u_resolution');
            cache.scaleLocation = gl.getUniformLocation(program, 'u_scale');
            cache.offsetLocation = gl.getUniformLocation(program, 'u_offset');
            cache.positionLocation = gl.getAttribLocation(program, 'a_position');
            cache.colorLocation = gl.getAttribLocation(program, 'a_color');

            figuresCache = cache;
        }

        function drawFigures(width, height, backgroundColor, figures, context) {
            if (!figuresCache) {
                initFiguresGL();
            }
            var cache = figuresCache, canvas = cache.canvas, gl = cache.gl;

            canvas.width = width;
            canvas.height = height;
            gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);
            gl.uniform2f(cache.resolutionLocation, width, height);

            // count triangle points
            var count = 0;
            var i, ii, rows;
            for (i = 0, ii = figures.length; i < ii; i++) {
                switch (figures[i].type) {
                    case 'lattice':
                        rows = (figures[i].coords.length / figures[i].verticesPerRow) | 0;
                        count += (rows - 1) * (figures[i].verticesPerRow - 1) * 6;
                        break;
                    case 'triangles':
                        count += figures[i].coords.length;
                        break;
                }
            }
            // transfer data
            var coords = new Float32Array(count * 2);
            var colors = new Uint8Array(count * 3);
            var coordsMap = context.coords, colorsMap = context.colors;
            var pIndex = 0, cIndex = 0;
            for (i = 0, ii = figures.length; i < ii; i++) {
                var figure = figures[i], ps = figure.coords, cs = figure.colors;
                switch (figure.type) {
                    case 'lattice':
                        var cols = figure.verticesPerRow;
                        rows = (ps.length / cols) | 0;
                        for (var row = 1; row < rows; row++) {
                            var offset = row * cols + 1;
                            for (var col = 1; col < cols; col++, offset++) {
                                coords[pIndex] = coordsMap[ps[offset - cols - 1]];
                                coords[pIndex + 1] = coordsMap[ps[offset - cols - 1] + 1];
                                coords[pIndex + 2] = coordsMap[ps[offset - cols]];
                                coords[pIndex + 3] = coordsMap[ps[offset - cols] + 1];
                                coords[pIndex + 4] = coordsMap[ps[offset - 1]];
                                coords[pIndex + 5] = coordsMap[ps[offset - 1] + 1];
                                colors[cIndex] = colorsMap[cs[offset - cols - 1]];
                                colors[cIndex + 1] = colorsMap[cs[offset - cols - 1] + 1];
                                colors[cIndex + 2] = colorsMap[cs[offset - cols - 1] + 2];
                                colors[cIndex + 3] = colorsMap[cs[offset - cols]];
                                colors[cIndex + 4] = colorsMap[cs[offset - cols] + 1];
                                colors[cIndex + 5] = colorsMap[cs[offset - cols] + 2];
                                colors[cIndex + 6] = colorsMap[cs[offset - 1]];
                                colors[cIndex + 7] = colorsMap[cs[offset - 1] + 1];
                                colors[cIndex + 8] = colorsMap[cs[offset - 1] + 2];

                                coords[pIndex + 6] = coords[pIndex + 2];
                                coords[pIndex + 7] = coords[pIndex + 3];
                                coords[pIndex + 8] = coords[pIndex + 4];
                                coords[pIndex + 9] = coords[pIndex + 5];
                                coords[pIndex + 10] = coordsMap[ps[offset]];
                                coords[pIndex + 11] = coordsMap[ps[offset] + 1];
                                colors[cIndex + 9] = colors[cIndex + 3];
                                colors[cIndex + 10] = colors[cIndex + 4];
                                colors[cIndex + 11] = colors[cIndex + 5];
                                colors[cIndex + 12] = colors[cIndex + 6];
                                colors[cIndex + 13] = colors[cIndex + 7];
                                colors[cIndex + 14] = colors[cIndex + 8];
                                colors[cIndex + 15] = colorsMap[cs[offset]];
                                colors[cIndex + 16] = colorsMap[cs[offset] + 1];
                                colors[cIndex + 17] = colorsMap[cs[offset] + 2];
                                pIndex += 12;
                                cIndex += 18;
                            }
                        }
                        break;
                    case 'triangles':
                        for (var j = 0, jj = ps.length; j < jj; j++) {
                            coords[pIndex] = coordsMap[ps[j]];
                            coords[pIndex + 1] = coordsMap[ps[j] + 1];
                            colors[cIndex] = colorsMap[cs[i]];
                            colors[cIndex + 1] = colorsMap[cs[j] + 1];
                            colors[cIndex + 2] = colorsMap[cs[j] + 2];
                            pIndex += 2;
                            cIndex += 3;
                        }
                        break;
                }
            }

            // draw
            if (backgroundColor) {
                gl.clearColor(backgroundColor[0] / 255, backgroundColor[1] / 255,
                    backgroundColor[2] / 255, 1.0);
            } else {
                gl.clearColor(0, 0, 0, 0);
            }
            gl.clear(gl.COLOR_BUFFER_BIT);

            var coordsBuffer = gl.createBuffer();
            gl.bindBuffer(gl.ARRAY_BUFFER, coordsBuffer);
            gl.bufferData(gl.ARRAY_BUFFER, coords, gl.STATIC_DRAW);
            gl.enableVertexAttribArray(cache.positionLocation);
            gl.vertexAttribPointer(cache.positionLocation, 2, gl.FLOAT, false, 0, 0);

            var colorsBuffer = gl.createBuffer();
            gl.bindBuffer(gl.ARRAY_BUFFER, colorsBuffer);
            gl.bufferData(gl.ARRAY_BUFFER, colors, gl.STATIC_DRAW);
            gl.enableVertexAttribArray(cache.colorLocation);
            gl.vertexAttribPointer(cache.colorLocation, 3, gl.UNSIGNED_BYTE, false,
                0, 0);

            gl.uniform2f(cache.scaleLocation, context.scaleX, context.scaleY);
            gl.uniform2f(cache.offsetLocation, context.offsetX, context.offsetY);

            gl.drawArrays(gl.TRIANGLES, 0, count);

            gl.flush();

            gl.deleteBuffer(coordsBuffer);
            gl.deleteBuffer(colorsBuffer);

            return canvas;
        }

        function cleanup() {
            if (smaskCache && smaskCache.canvas) {
                smaskCache.canvas.width = 0;
                smaskCache.canvas.height = 0;
            }
            if (figuresCache && figuresCache.canvas) {
                figuresCache.canvas.width = 0;
                figuresCache.canvas.height = 0;
            }
            smaskCache = null;
            figuresCache = null;
        }

        return {
            get isEnabled() {
                if (PDFJS.disableWebGL) {
                    return false;
                }
                var enabled = false;
                try {
                    generateGL();
                    enabled = !!currentGL;
                } catch (e) { }
                return shadow(this, 'isEnabled', enabled);
            },
            composeSMask: composeSMask,
            drawFigures: drawFigures,
            clear: cleanup
        };
    })();


    var ShadingIRs = {};

    ShadingIRs.RadialAxial = {
        fromIR: function RadialAxial_fromIR(raw) {
            var type = raw[1];
            var colorStops = raw[2];
            var p0 = raw[3];
            var p1 = raw[4];
            var r0 = raw[5];
            var r1 = raw[6];
            return {
                type: 'Pattern',
                getPattern: function RadialAxial_getPattern(ctx) {
                    var grad;
                    if (type === 'axial') {
                        grad = ctx.createLinearGradient(p0[0], p0[1], p1[0], p1[1]);
                    } else if (type === 'radial') {
                        grad = ctx.createRadialGradient(p0[0], p0[1], r0, p1[0], p1[1], r1);
                    }

                    for (var i = 0, ii = colorStops.length; i < ii; ++i) {
                        var c = colorStops[i];
                        grad.addColorStop(c[0], c[1]);
                    }
                    return grad;
                }
            };
        }
    };

    var createMeshCanvas = (function createMeshCanvasClosure() {
        function drawTriangle(data, context, p1, p2, p3, c1, c2, c3) {
            // Very basic Gouraud-shaded triangle rasterization algorithm.
            var coords = context.coords, colors = context.colors;
            var bytes = data.data, rowSize = data.width * 4;
            var tmp;
            if (coords[p1 + 1] > coords[p2 + 1]) {
                tmp = p1; p1 = p2; p2 = tmp; tmp = c1; c1 = c2; c2 = tmp;
            }
            if (coords[p2 + 1] > coords[p3 + 1]) {
                tmp = p2; p2 = p3; p3 = tmp; tmp = c2; c2 = c3; c3 = tmp;
            }
            if (coords[p1 + 1] > coords[p2 + 1]) {
                tmp = p1; p1 = p2; p2 = tmp; tmp = c1; c1 = c2; c2 = tmp;
            }
            var x1 = (coords[p1] + context.offsetX) * context.scaleX;
            var y1 = (coords[p1 + 1] + context.offsetY) * context.scaleY;
            var x2 = (coords[p2] + context.offsetX) * context.scaleX;
            var y2 = (coords[p2 + 1] + context.offsetY) * context.scaleY;
            var x3 = (coords[p3] + context.offsetX) * context.scaleX;
            var y3 = (coords[p3 + 1] + context.offsetY) * context.scaleY;
            if (y1 >= y3) {
                return;
            }
            var c1r = colors[c1], c1g = colors[c1 + 1], c1b = colors[c1 + 2];
            var c2r = colors[c2], c2g = colors[c2 + 1], c2b = colors[c2 + 2];
            var c3r = colors[c3], c3g = colors[c3 + 1], c3b = colors[c3 + 2];

            var minY = Math.round(y1), maxY = Math.round(y3);
            var xa, car, cag, cab;
            var xb, cbr, cbg, cbb;
            var k;
            for (var y = minY; y <= maxY; y++) {
                if (y < y2) {
                    k = y < y1 ? 0 : y1 === y2 ? 1 : (y1 - y) / (y1 - y2);
                    xa = x1 - (x1 - x2) * k;
                    car = c1r - (c1r - c2r) * k;
                    cag = c1g - (c1g - c2g) * k;
                    cab = c1b - (c1b - c2b) * k;
                } else {
                    k = y > y3 ? 1 : y2 === y3 ? 0 : (y2 - y) / (y2 - y3);
                    xa = x2 - (x2 - x3) * k;
                    car = c2r - (c2r - c3r) * k;
                    cag = c2g - (c2g - c3g) * k;
                    cab = c2b - (c2b - c3b) * k;
                }
                k = y < y1 ? 0 : y > y3 ? 1 : (y1 - y) / (y1 - y3);
                xb = x1 - (x1 - x3) * k;
                cbr = c1r - (c1r - c3r) * k;
                cbg = c1g - (c1g - c3g) * k;
                cbb = c1b - (c1b - c3b) * k;
                var x1_ = Math.round(Math.min(xa, xb));
                var x2_ = Math.round(Math.max(xa, xb));
                var j = rowSize * y + x1_ * 4;
                for (var x = x1_; x <= x2_; x++) {
                    k = (xa - x) / (xa - xb);
                    k = k < 0 ? 0 : k > 1 ? 1 : k;
                    bytes[j++] = (car - (car - cbr) * k) | 0;
                    bytes[j++] = (cag - (cag - cbg) * k) | 0;
                    bytes[j++] = (cab - (cab - cbb) * k) | 0;
                    bytes[j++] = 255;
                }
            }
        }

        function drawFigure(data, figure, context) {
            var ps = figure.coords;
            var cs = figure.colors;
            var i, ii;
            switch (figure.type) {
                case 'lattice':
                    var verticesPerRow = figure.verticesPerRow;
                    var rows = Math.floor(ps.length / verticesPerRow) - 1;
                    var cols = verticesPerRow - 1;
                    for (i = 0; i < rows; i++) {
                        var q = i * verticesPerRow;
                        for (var j = 0; j < cols; j++, q++) {
                            drawTriangle(data, context,
                                ps[q], ps[q + 1], ps[q + verticesPerRow],
                                cs[q], cs[q + 1], cs[q + verticesPerRow]);
                            drawTriangle(data, context,
                                ps[q + verticesPerRow + 1], ps[q + 1], ps[q + verticesPerRow],
                                cs[q + verticesPerRow + 1], cs[q + 1], cs[q + verticesPerRow]);
                        }
                    }
                    break;
                case 'triangles':
                    for (i = 0, ii = ps.length; i < ii; i += 3) {
                        drawTriangle(data, context,
                            ps[i], ps[i + 1], ps[i + 2],
                            cs[i], cs[i + 1], cs[i + 2]);
                    }
                    break;
                default:
                    error('illigal figure');
                    break;
            }
        }

        function createMeshCanvas(bounds, combinesScale, coords, colors, figures,
                                  backgroundColor) {
            // we will increase scale on some weird factor to let antialiasing take
            // care of "rough" edges
            var EXPECTED_SCALE = 1.1;
            // MAX_PATTERN_SIZE is used to avoid OOM situation.
            var MAX_PATTERN_SIZE = 3000; // 10in @ 300dpi shall be enough

            var offsetX = Math.floor(bounds[0]);
            var offsetY = Math.floor(bounds[1]);
            var boundsWidth = Math.ceil(bounds[2]) - offsetX;
            var boundsHeight = Math.ceil(bounds[3]) - offsetY;

            var width = Math.min(Math.ceil(Math.abs(boundsWidth * combinesScale[0] *
                EXPECTED_SCALE)), MAX_PATTERN_SIZE);
            var height = Math.min(Math.ceil(Math.abs(boundsHeight * combinesScale[1] *
                EXPECTED_SCALE)), MAX_PATTERN_SIZE);
            var scaleX = boundsWidth / width;
            var scaleY = boundsHeight / height;

            var context = {
                coords: coords,
                colors: colors,
                offsetX: -offsetX,
                offsetY: -offsetY,
                scaleX: 1 / scaleX,
                scaleY: 1 / scaleY
            };

            var canvas, tmpCanvas, i, ii;
            if (WebGLUtils.isEnabled) {
                canvas = WebGLUtils.drawFigures(width, height, backgroundColor,
                    figures, context);

                // https://bugzilla.mozilla.org/show_bug.cgi?id=972126
                tmpCanvas = CachedCanvases.getCanvas('mesh', width, height, false);
                tmpCanvas.context.drawImage(canvas, 0, 0);
                canvas = tmpCanvas.canvas;
            } else {
                tmpCanvas = CachedCanvases.getCanvas('mesh', width, height, false);
                var tmpCtx = tmpCanvas.context;

                var data = tmpCtx.createImageData(width, height);
                if (backgroundColor) {
                    var bytes = data.data;
                    for (i = 0, ii = bytes.length; i < ii; i += 4) {
                        bytes[i] = backgroundColor[0];
                        bytes[i + 1] = backgroundColor[1];
                        bytes[i + 2] = backgroundColor[2];
                        bytes[i + 3] = 255;
                    }
                }
                for (i = 0; i < figures.length; i++) {
                    drawFigure(data, figures[i], context);
                }
                tmpCtx.putImageData(data, 0, 0);
                canvas = tmpCanvas.canvas;
            }

            return {canvas: canvas, offsetX: offsetX, offsetY: offsetY,
                scaleX: scaleX, scaleY: scaleY};
        }
        return createMeshCanvas;
    })();

    ShadingIRs.Mesh = {
        fromIR: function Mesh_fromIR(raw) {
            //var type = raw[1];
            var coords = raw[2];
            var colors = raw[3];
            var figures = raw[4];
            var bounds = raw[5];
            var matrix = raw[6];
            //var bbox = raw[7];
            var background = raw[8];
            return {
                type: 'Pattern',
                getPattern: function Mesh_getPattern(ctx, owner, shadingFill) {
                    var scale;
                    if (shadingFill) {
                        scale = Util.singularValueDecompose2dScale(ctx.mozCurrentTransform);
                    } else {
                        // Obtain scale from matrix and current transformation matrix.
                        scale = Util.singularValueDecompose2dScale(owner.baseTransform);
                        if (matrix) {
                            var matrixScale = Util.singularValueDecompose2dScale(matrix);
                            scale = [scale[0] * matrixScale[0],
                                scale[1] * matrixScale[1]];
                        }
                    }


                    // Rasterizing on the main thread since sending/queue large canvases
                    // might cause OOM.
                    var temporaryPatternCanvas = createMeshCanvas(bounds, scale, coords,
                        colors, figures, shadingFill ? null : background);

                    if (!shadingFill) {
                        ctx.setTransform.apply(ctx, owner.baseTransform);
                        if (matrix) {
                            ctx.transform.apply(ctx, matrix);
                        }
                    }

                    ctx.translate(temporaryPatternCanvas.offsetX,
                        temporaryPatternCanvas.offsetY);
                    ctx.scale(temporaryPatternCanvas.scaleX,
                        temporaryPatternCanvas.scaleY);

                    return ctx.createPattern(temporaryPatternCanvas.canvas, 'no-repeat');
                }
            };
        }
    };

    ShadingIRs.Dummy = {
        fromIR: function Dummy_fromIR() {
            return {
                type: 'Pattern',
                getPattern: function Dummy_fromIR_getPattern() {
                    return 'hotpink';
                }
            };
        }
    };

    function getShadingPatternFromIR(raw) {
        var shadingIR = ShadingIRs[raw[0]];
        if (!shadingIR) {
            error('Unknown IR type: ' + raw[0]);
        }
        return shadingIR.fromIR(raw);
    }

    var TilingPattern = (function TilingPatternClosure() {
        var PaintType = {
            COLORED: 1,
            UNCOLORED: 2
        };

        var MAX_PATTERN_SIZE = 3000; // 10in @ 300dpi shall be enough

        function TilingPattern(IR, color, ctx, objs, commonObjs, baseTransform) {
            this.operatorList = IR[2];
            this.matrix = IR[3] || [1, 0, 0, 1, 0, 0];
            this.bbox = IR[4];
            this.xstep = IR[5];
            this.ystep = IR[6];
            this.paintType = IR[7];
            this.tilingType = IR[8];
            this.color = color;
            this.objs = objs;
            this.commonObjs = commonObjs;
            this.baseTransform = baseTransform;
            this.type = 'Pattern';
            this.ctx = ctx;
        }

        TilingPattern.prototype = {
            createPatternCanvas: function TilinPattern_createPatternCanvas(owner) {
                var operatorList = this.operatorList;
                var bbox = this.bbox;
                var xstep = this.xstep;
                var ystep = this.ystep;
                var paintType = this.paintType;
                var tilingType = this.tilingType;
                var color = this.color;
                var objs = this.objs;
                var commonObjs = this.commonObjs;

                info('TilingType: ' + tilingType);

                var x0 = bbox[0], y0 = bbox[1], x1 = bbox[2], y1 = bbox[3];

                var topLeft = [x0, y0];
                // we want the canvas to be as large as the step size
                var botRight = [x0 + xstep, y0 + ystep];

                var width = botRight[0] - topLeft[0];
                var height = botRight[1] - topLeft[1];

                // Obtain scale from matrix and current transformation matrix.
                var matrixScale = Util.singularValueDecompose2dScale(this.matrix);
                var curMatrixScale = Util.singularValueDecompose2dScale(
                    this.baseTransform);
                var combinedScale = [matrixScale[0] * curMatrixScale[0],
                    matrixScale[1] * curMatrixScale[1]];

                // MAX_PATTERN_SIZE is used to avoid OOM situation.
                // Use width and height values that are as close as possible to the end
                // result when the pattern is used. Too low value makes the pattern look
                // blurry. Too large value makes it look too crispy.
                width = Math.min(Math.ceil(Math.abs(width * combinedScale[0])),
                    MAX_PATTERN_SIZE);

                height = Math.min(Math.ceil(Math.abs(height * combinedScale[1])),
                    MAX_PATTERN_SIZE);

                var tmpCanvas = CachedCanvases.getCanvas('pattern', width, height, true);
                var tmpCtx = tmpCanvas.context;
                var graphics = new CanvasGraphics(tmpCtx, commonObjs, objs);
                graphics.groupLevel = owner.groupLevel;

                this.setFillAndStrokeStyleToContext(tmpCtx, paintType, color);

                this.setScale(width, height, xstep, ystep);
                this.transformToScale(graphics);

                // transform coordinates to pattern space
                var tmpTranslate = [1, 0, 0, 1, -topLeft[0], -topLeft[1]];
                graphics.transform.apply(graphics, tmpTranslate);

                this.clipBbox(graphics, bbox, x0, y0, x1, y1);

                graphics.executeOperatorList(operatorList);
                return tmpCanvas.canvas;
            },

            setScale: function TilingPattern_setScale(width, height, xstep, ystep) {
                this.scale = [width / xstep, height / ystep];
            },

            transformToScale: function TilingPattern_transformToScale(graphics) {
                var scale = this.scale;
                var tmpScale = [scale[0], 0, 0, scale[1], 0, 0];
                graphics.transform.apply(graphics, tmpScale);
            },

            scaleToContext: function TilingPattern_scaleToContext() {
                var scale = this.scale;
                this.ctx.scale(1 / scale[0], 1 / scale[1]);
            },

            clipBbox: function clipBbox(graphics, bbox, x0, y0, x1, y1) {
                if (bbox && isArray(bbox) && bbox.length === 4) {
                    var bboxWidth = x1 - x0;
                    var bboxHeight = y1 - y0;
                    graphics.ctx.rect(x0, y0, bboxWidth, bboxHeight);
                    graphics.clip();
                    graphics.endPath();
                }
            },

            setFillAndStrokeStyleToContext:
                function setFillAndStrokeStyleToContext(context, paintType, color) {
                    switch (paintType) {
                        case PaintType.COLORED:
                            var ctx = this.ctx;
                            context.fillStyle = ctx.fillStyle;
                            context.strokeStyle = ctx.strokeStyle;
                            break;
                        case PaintType.UNCOLORED:
                            var cssColor = Util.makeCssRgb(color[0], color[1], color[2]);
                            context.fillStyle = cssColor;
                            context.strokeStyle = cssColor;
                            break;
                        default:
                            error('Unsupported paint type: ' + paintType);
                    }
                },

            getPattern: function TilingPattern_getPattern(ctx, owner) {
                var temporaryPatternCanvas = this.createPatternCanvas(owner);

                ctx = this.ctx;
                ctx.setTransform.apply(ctx, this.baseTransform);
                ctx.transform.apply(ctx, this.matrix);
                this.scaleToContext();

                return ctx.createPattern(temporaryPatternCanvas, 'repeat');
            }
        };

        return TilingPattern;
    })();


    PDFJS.disableFontFace = false;

    var FontLoader = {
        insertRule: function fontLoaderInsertRule(rule) {
            var styleElement = document.getElementById('PDFJS_FONT_STYLE_TAG');
            if (!styleElement) {
                styleElement = document.createElement('style');
                styleElement.id = 'PDFJS_FONT_STYLE_TAG';
                document.documentElement.getElementsByTagName('head')[0].appendChild(
                    styleElement);
            }

            var styleSheet = styleElement.sheet;
            styleSheet.insertRule(rule, styleSheet.cssRules.length);
        },

        clear: function fontLoaderClear() {
            var styleElement = document.getElementById('PDFJS_FONT_STYLE_TAG');
            if (styleElement) {
                styleElement.parentNode.removeChild(styleElement);
            }
            this.nativeFontFaces.forEach(function(nativeFontFace) {
                document.fonts.delete(nativeFontFace);
            });
            this.nativeFontFaces.length = 0;
        },
        get loadTestFont() {
            // This is a CFF font with 1 glyph for '.' that fills its entire width and
            // height.
            return shadow(this, 'loadTestFont', atob(
                'T1RUTwALAIAAAwAwQ0ZGIDHtZg4AAAOYAAAAgUZGVE1lkzZwAAAEHAAAABxHREVGABQAFQ' +
                'AABDgAAAAeT1MvMlYNYwkAAAEgAAAAYGNtYXABDQLUAAACNAAAAUJoZWFk/xVFDQAAALwA' +
                'AAA2aGhlYQdkA+oAAAD0AAAAJGhtdHgD6AAAAAAEWAAAAAZtYXhwAAJQAAAAARgAAAAGbm' +
                'FtZVjmdH4AAAGAAAAAsXBvc3T/hgAzAAADeAAAACAAAQAAAAEAALZRFsRfDzz1AAsD6AAA' +
                'AADOBOTLAAAAAM4KHDwAAAAAA+gDIQAAAAgAAgAAAAAAAAABAAADIQAAAFoD6AAAAAAD6A' +
                'ABAAAAAAAAAAAAAAAAAAAAAQAAUAAAAgAAAAQD6AH0AAUAAAKKArwAAACMAooCvAAAAeAA' +
                'MQECAAACAAYJAAAAAAAAAAAAAQAAAAAAAAAAAAAAAFBmRWQAwAAuAC4DIP84AFoDIQAAAA' +
                'AAAQAAAAAAAAAAACAAIAABAAAADgCuAAEAAAAAAAAAAQAAAAEAAAAAAAEAAQAAAAEAAAAA' +
                'AAIAAQAAAAEAAAAAAAMAAQAAAAEAAAAAAAQAAQAAAAEAAAAAAAUAAQAAAAEAAAAAAAYAAQ' +
                'AAAAMAAQQJAAAAAgABAAMAAQQJAAEAAgABAAMAAQQJAAIAAgABAAMAAQQJAAMAAgABAAMA' +
                'AQQJAAQAAgABAAMAAQQJAAUAAgABAAMAAQQJAAYAAgABWABYAAAAAAAAAwAAAAMAAAAcAA' +
                'EAAAAAADwAAwABAAAAHAAEACAAAAAEAAQAAQAAAC7//wAAAC7////TAAEAAAAAAAABBgAA' +
                'AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEAAAAAAA' +
                'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA' +
                'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA' +
                'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA' +
                'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMAAA' +
                'AAAAD/gwAyAAAAAQAAAAAAAAAAAAAAAAAAAAABAAQEAAEBAQJYAAEBASH4DwD4GwHEAvgc' +
                'A/gXBIwMAYuL+nz5tQXkD5j3CBLnEQACAQEBIVhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWF' +
                'hYWFhYWFhYAAABAQAADwACAQEEE/t3Dov6fAH6fAT+fPp8+nwHDosMCvm1Cvm1DAz6fBQA' +
                'AAAAAAABAAAAAMmJbzEAAAAAzgTjFQAAAADOBOQpAAEAAAAAAAAADAAUAAQAAAABAAAAAg' +
                'ABAAAAAAAAAAAD6AAAAAAAAA=='
            ));
        },

        loadTestFontId: 0,

        loadingContext: {
            requests: [],
            nextRequestId: 0
        },

        isSyncFontLoadingSupported: (function detectSyncFontLoadingSupport() {
            if (isWorker) {
                return false;
            }

            // User agent string sniffing is bad, but there is no reliable way to tell
            // if font is fully loaded and ready to be used with canvas.
            var userAgent = window.navigator.userAgent;
            var m = /Mozilla\/5.0.*?rv:(\d+).*? Gecko/.exec(userAgent);
            if (m && m[1] >= 14) {
                return true;
            }
            // TODO other browsers
            if (userAgent === 'node') {
                return true;
            }
            return false;
        })(),

        nativeFontFaces: [],

        isFontLoadingAPISupported: (!isWorker && typeof document !== 'undefined' &&
            !!document.fonts),

        addNativeFontFace: function fontLoader_addNativeFontFace(nativeFontFace) {
            this.nativeFontFaces.push(nativeFontFace);
            document.fonts.add(nativeFontFace);
        },

        bind: function fontLoaderBind(fonts, callback) {
            assert(!isWorker, 'bind() shall be called from main thread');

            var rules = [];
            var fontsToLoad = [];
            var fontLoadPromises = [];
            for (var i = 0, ii = fonts.length; i < ii; i++) {
                var font = fonts[i];

                // Add the font to the DOM only once or skip if the font
                // is already loaded.
                if (font.attached || font.loading === false) {
                    continue;
                }
                font.attached = true;

                if (this.isFontLoadingAPISupported) {
                    var nativeFontFace = font.createNativeFontFace();
                    if (nativeFontFace) {
                        fontLoadPromises.push(nativeFontFace.loaded);
                    }
                } else {
                    var rule = font.bindDOM();
                    if (rule) {
                        rules.push(rule);
                        fontsToLoad.push(font);
                    }
                }
            }

            var request = FontLoader.queueLoadingCallback(callback);
            if (this.isFontLoadingAPISupported) {
                Promise.all(fontsToLoad).then(function() {
                    request.complete();
                });
            } else if (rules.length > 0 && !this.isSyncFontLoadingSupported) {
                FontLoader.prepareFontLoadEvent(rules, fontsToLoad, request);
            } else {
                request.complete();
            }
        },

        queueLoadingCallback: function FontLoader_queueLoadingCallback(callback) {
            function LoadLoader_completeRequest() {
                assert(!request.end, 'completeRequest() cannot be called twice');
                request.end = Date.now();

                // sending all completed requests in order how they were queued
                while (context.requests.length > 0 && context.requests[0].end) {
                    var otherRequest = context.requests.shift();
                    setTimeout(otherRequest.callback, 0);
                }
            }

            var context = FontLoader.loadingContext;
            var requestId = 'pdfjs-font-loading-' + (context.nextRequestId++);
            var request = {
                id: requestId,
                complete: LoadLoader_completeRequest,
                callback: callback,
                started: Date.now()
            };
            context.requests.push(request);
            return request;
        },

        prepareFontLoadEvent: function fontLoaderPrepareFontLoadEvent(rules,
                                                                      fonts,
                                                                      request) {
            /** Hack begin */
            // There's currently no event when a font has finished downloading so the
            // following code is a dirty hack to 'guess' when a font is
            // ready. It's assumed fonts are loaded in order, so add a known test
            // font after the desired fonts and then test for the loading of that
            // test font.

            function int32(data, offset) {
                return (data.charCodeAt(offset) << 24) |
                    (data.charCodeAt(offset + 1) << 16) |
                    (data.charCodeAt(offset + 2) << 8) |
                    (data.charCodeAt(offset + 3) & 0xff);
            }

            function spliceString(s, offset, remove, insert) {
                var chunk1 = s.substr(0, offset);
                var chunk2 = s.substr(offset + remove);
                return chunk1 + insert + chunk2;
            }

            var i, ii;

            var canvas = document.createElement('canvas');
            canvas.width = 1;
            canvas.height = 1;
            var ctx = canvas.getContext('2d');

            var called = 0;
            function isFontReady(name, callback) {
                called++;
                // With setTimeout clamping this gives the font ~100ms to load.
                if(called > 30) {
                    warn('Load test font never loaded.');
                    callback();
                    return;
                }
                ctx.font = '30px ' + name;
                ctx.fillText('.', 0, 20);
                var imageData = ctx.getImageData(0, 0, 1, 1);
                if (imageData.data[3] > 0) {
                    callback();
                    return;
                }
                setTimeout(isFontReady.bind(null, name, callback));
            }

            var loadTestFontId = 'lt' + Date.now() + this.loadTestFontId++;
            // Chromium seems to cache fonts based on a hash of the actual font data,
            // so the font must be modified for each load test else it will appear to
            // be loaded already.
            // TODO: This could maybe be made faster by avoiding the btoa of the full
            // font by splitting it in chunks before hand and padding the font id.
            var data = this.loadTestFont;
            var COMMENT_OFFSET = 976; // has to be on 4 byte boundary (for checksum)
            data = spliceString(data, COMMENT_OFFSET, loadTestFontId.length,
                loadTestFontId);
            // CFF checksum is important for IE, adjusting it
            var CFF_CHECKSUM_OFFSET = 16;
            var XXXX_VALUE = 0x58585858; // the "comment" filled with 'X'
            var checksum = int32(data, CFF_CHECKSUM_OFFSET);
            for (i = 0, ii = loadTestFontId.length - 3; i < ii; i += 4) {
                checksum = (checksum - XXXX_VALUE + int32(loadTestFontId, i)) | 0;
            }
            if (i < loadTestFontId.length) { // align to 4 bytes boundary
                checksum = (checksum - XXXX_VALUE +
                    int32(loadTestFontId + 'XXX', i)) | 0;
            }
            data = spliceString(data, CFF_CHECKSUM_OFFSET, 4, string32(checksum));

            var url = 'url(data:font/opentype;base64,' + btoa(data) + ');';
            var rule = '@font-face { font-family:"' + loadTestFontId + '";src:' +
                url + '}';
            FontLoader.insertRule(rule);

            var names = [];
            for (i = 0, ii = fonts.length; i < ii; i++) {
                names.push(fonts[i].loadedName);
            }
            names.push(loadTestFontId);

            var div = document.createElement('div');
            div.setAttribute('style',
                'visibility: hidden;' +
                'width: 10px; height: 10px;' +
                'position: absolute; top: 0px; left: 0px;');
            for (i = 0, ii = names.length; i < ii; ++i) {
                var span = document.createElement('span');
                span.textContent = 'Hi';
                span.style.fontFamily = names[i];
                div.appendChild(span);
            }
            document.body.appendChild(div);

            isFontReady(loadTestFontId, function() {
                document.body.removeChild(div);
                request.complete();
            });
            /** Hack end */
        }
    };

    var FontFaceObject = (function FontFaceObjectClosure() {
        function FontFaceObject(name, file, properties) {
            this.compiledGlyphs = {};
            if (arguments.length === 1) {
                // importing translated data
                var data = arguments[0];
                for (var i in data) {
                    this[i] = data[i];
                }
                return;
            }
        }
        FontFaceObject.prototype = {
            createNativeFontFace: function FontFaceObject_createNativeFontFace() {
                if (!this.data) {
                    return null;
                }

                if (PDFJS.disableFontFace) {
                    this.disableFontFace = true;
                    return null;
                }

                var nativeFontFace = new FontFace(this.loadedName, this.data, {});

                FontLoader.addNativeFontFace(nativeFontFace);

                if (PDFJS.pdfBug && 'FontInspector' in globalScope &&
                    globalScope['FontInspector'].enabled) {
                    globalScope['FontInspector'].fontAdded(this);
                }
                return nativeFontFace;
            },

            bindDOM: function FontFaceObject_bindDOM() {
                if (!this.data) {
                    return null;
                }

                if (PDFJS.disableFontFace) {
                    this.disableFontFace = true;
                    return null;
                }

                var data = bytesToString(new Uint8Array(this.data));
                var fontName = this.loadedName;

                // Add the font-face rule to the document
                var url = ('url(data:' + this.mimetype + ';base64,' +
                    window.btoa(data) + ');');
                var rule = '@font-face { font-family:"' + fontName + '";src:' + url + '}';
                FontLoader.insertRule(rule);

                if (PDFJS.pdfBug && 'FontInspector' in globalScope &&
                    globalScope['FontInspector'].enabled) {
                    globalScope['FontInspector'].fontAdded(this, url);
                }

                return rule;
            },

            getPathGenerator: function FontLoader_getPathGenerator(objs, character) {
                if (!(character in this.compiledGlyphs)) {
                    var js = objs.get(this.loadedName + '_path_' + character);
                    /*jshint -W054 */
                    this.compiledGlyphs[character] = new Function('c', 'size', js);
                }
                return this.compiledGlyphs[character];
            }
        };
        return FontFaceObject;
    })();


    var ANNOT_MIN_SIZE = 10; // px

    var AnnotationUtils = (function AnnotationUtilsClosure() {
        // TODO(mack): This dupes some of the logic in CanvasGraphics.setFont()
        function setTextStyles(element, item, fontObj) {

            var style = element.style;
            style.fontSize = item.fontSize + 'px';
            style.direction = item.fontDirection < 0 ? 'rtl': 'ltr';

            if (!fontObj) {
                return;
            }

            style.fontWeight = fontObj.black ?
                (fontObj.bold ? 'bolder' : 'bold') :
                (fontObj.bold ? 'bold' : 'normal');
            style.fontStyle = fontObj.italic ? 'italic' : 'normal';

            var fontName = fontObj.loadedName;
            var fontFamily = fontName ? '"' + fontName + '", ' : '';
            // Use a reasonable default font if the font doesn't specify a fallback
            var fallbackName = fontObj.fallbackName || 'Helvetica, sans-serif';
            style.fontFamily = fontFamily + fallbackName;
        }

        function initContainer(item, drawBorder) {
            var container = document.createElement('section');
            var cstyle = container.style;
            var width = item.rect[2] - item.rect[0];
            var height = item.rect[3] - item.rect[1];

            var bWidth = item.borderWidth || 0;
            if (bWidth) {
                width = width - 2 * bWidth;
                height = height - 2 * bWidth;
                cstyle.borderWidth = bWidth + 'px';
                var color = item.color;
                if (drawBorder && color) {
                    cstyle.borderStyle = 'solid';
                    cstyle.borderColor = Util.makeCssRgb(Math.round(color[0] * 255),
                        Math.round(color[1] * 255),
                        Math.round(color[2] * 255));
                }
            }
            cstyle.width = width + 'px';
            cstyle.height = height + 'px';
            return container;
        }

        function getHtmlElementForTextWidgetAnnotation(item, commonObjs) {
            var element = document.createElement('div');
            var width = item.rect[2] - item.rect[0];
            var height = item.rect[3] - item.rect[1];
            element.style.width = width + 'px';
            element.style.height = height + 'px';
            element.style.display = 'table';

            var content = document.createElement('div');
            content.textContent = item.fieldValue;
            var textAlignment = item.textAlignment;
            content.style.textAlign = ['left', 'center', 'right'][textAlignment];
            content.style.verticalAlign = 'middle';
            content.style.display = 'table-cell';

            var fontObj = item.fontRefName ?
                commonObjs.getData(item.fontRefName) : null;
            setTextStyles(content, item, fontObj);

            element.appendChild(content);

            return element;
        }

        function getHtmlElementForTextAnnotation(item) {
            var rect = item.rect;

            // sanity check because of OOo-generated PDFs
            if ((rect[3] - rect[1]) < ANNOT_MIN_SIZE) {
                rect[3] = rect[1] + ANNOT_MIN_SIZE;
            }
            if ((rect[2] - rect[0]) < ANNOT_MIN_SIZE) {
                rect[2] = rect[0] + (rect[3] - rect[1]); // make it square
            }

            var container = initContainer(item, false);
            container.className = 'annotText';

            var image  = document.createElement('img');
            image.style.height = container.style.height;
            image.style.width = container.style.width;
            var iconName = item.name;
            image.src = PDFJS.imageResourcesPath + 'annotation-' +
                iconName.toLowerCase() + '.svg';
            image.alt = '[{{type}} Annotation]';
            image.dataset.l10nId = 'text_annotation_type';
            image.dataset.l10nArgs = JSON.stringify({type: iconName});

            var contentWrapper = document.createElement('div');
            contentWrapper.className = 'annotTextContentWrapper';
            contentWrapper.style.left = Math.floor(rect[2] - rect[0] + 5) + 'px';
            contentWrapper.style.top = '-10px';

            var content = document.createElement('div');
            content.className = 'annotTextContent';
            content.setAttribute('hidden', true);

            var i, ii;
            if (item.hasBgColor) {
                var color = item.color;

                // Enlighten the color (70%)
                var BACKGROUND_ENLIGHT = 0.7;
                var r = BACKGROUND_ENLIGHT * (1.0 - color[0]) + color[0];
                var g = BACKGROUND_ENLIGHT * (1.0 - color[1]) + color[1];
                var b = BACKGROUND_ENLIGHT * (1.0 - color[2]) + color[2];
                content.style.backgroundColor = Util.makeCssRgb((r * 255) | 0,
                    (g * 255) | 0,
                    (b * 255) | 0);
            }

            var title = document.createElement('h1');
            var text = document.createElement('p');
            title.textContent = item.title;

            if (!item.content && !item.title) {
                content.setAttribute('hidden', true);
            } else {
                var e = document.createElement('span');
                var lines = item.content.split(/(?:\r\n?|\n)/);
                for (i = 0, ii = lines.length; i < ii; ++i) {
                    var line = lines[i];
                    e.appendChild(document.createTextNode(line));
                    if (i < (ii - 1)) {
                        e.appendChild(document.createElement('br'));
                    }
                }
                text.appendChild(e);

                var pinned = false;

                var showAnnotation = function showAnnotation(pin) {
                    if (pin) {
                        pinned = true;
                    }
                    if (content.hasAttribute('hidden')) {
                        container.style.zIndex += 1;
                        content.removeAttribute('hidden');
                    }
                };

                var hideAnnotation = function hideAnnotation(unpin) {
                    if (unpin) {
                        pinned = false;
                    }
                    if (!content.hasAttribute('hidden') && !pinned) {
                        container.style.zIndex -= 1;
                        content.setAttribute('hidden', true);
                    }
                };

                var toggleAnnotation = function toggleAnnotation() {
                    if (pinned) {
                        hideAnnotation(true);
                    } else {
                        showAnnotation(true);
                    }
                };

                image.addEventListener('click', function image_clickHandler() {
                    toggleAnnotation();
                }, false);
                image.addEventListener('mouseover', function image_mouseOverHandler() {
                    showAnnotation();
                }, false);
                image.addEventListener('mouseout', function image_mouseOutHandler() {
                    hideAnnotation();
                }, false);

                content.addEventListener('click', function content_clickHandler() {
                    hideAnnotation(true);
                }, false);
            }

            content.appendChild(title);
            content.appendChild(text);
            contentWrapper.appendChild(content);
            container.appendChild(image);
            container.appendChild(contentWrapper);

            return container;
        }

        function getHtmlElementForLinkAnnotation(item) {
            var container = initContainer(item, true);
            container.className = 'annotLink';

            var link = document.createElement('a');
            link.href = link.title = item.url || '';
            if (item.url && PDFJS.openExternalLinksInNewWindow) {
                link.target = '_blank';
            }

            container.appendChild(link);

            return container;
        }

        function getHtmlElement(data, objs) {
            switch (data.annotationType) {
                case AnnotationType.WIDGET:
                    return getHtmlElementForTextWidgetAnnotation(data, objs);
                case AnnotationType.TEXT:
                    return getHtmlElementForTextAnnotation(data);
                case AnnotationType.LINK:
                    return getHtmlElementForLinkAnnotation(data);
                default:
                    throw new Error('Unsupported annotationType: ' + data.annotationType);
            }
        }

        return {
            getHtmlElement: getHtmlElement
        };
    })();
    PDFJS.AnnotationUtils = AnnotationUtils;


    var SVG_DEFAULTS = {
        fontStyle: 'normal',
        fontWeight: 'normal',
        fillColor: '#000000'
    };

    var convertImgDataToPng = (function convertImgDataToPngClosure() {
        var PNG_HEADER =
            new Uint8Array([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a]);

        var CHUNK_WRAPPER_SIZE = 12;

        var crcTable = new Int32Array(256);
        for (var i = 0; i < 256; i++) {
            var c = i;
            for (var h = 0; h < 8; h++) {
                if (c & 1) {
                    c = 0xedB88320 ^ ((c >> 1) & 0x7fffffff);
                } else {
                    c = (c >> 1) & 0x7fffffff;
                }
            }
            crcTable[i] = c;
        }

        function crc32(data, start, end) {
            var crc = -1;
            for (var i = start; i < end; i++) {
                var a = (crc ^ data[i]) & 0xff;
                var b = crcTable[a];
                crc = (crc >>> 8) ^ b;
            }
            return crc ^ -1;
        }

        function writePngChunk(type, body, data, offset) {
            var p = offset;
            var len = body.length;

            data[p] = len >> 24 & 0xff;
            data[p + 1] = len >> 16 & 0xff;
            data[p + 2] = len >> 8 & 0xff;
            data[p + 3] = len & 0xff;
            p += 4;

            data[p] = type.charCodeAt(0) & 0xff;
            data[p + 1] = type.charCodeAt(1) & 0xff;
            data[p + 2] = type.charCodeAt(2) & 0xff;
            data[p + 3] = type.charCodeAt(3) & 0xff;
            p += 4;

            data.set(body, p);
            p += body.length;

            var crc = crc32(data, offset + 4, p);

            data[p] = crc >> 24 & 0xff;
            data[p + 1] = crc >> 16 & 0xff;
            data[p + 2] = crc >> 8 & 0xff;
            data[p + 3] = crc & 0xff;
        }

        function adler32(data, start, end) {
            var a = 1;
            var b = 0;
            for (var i = start; i < end; ++i) {
                a = (a + (data[i] & 0xff)) % 65521;
                b = (b + a) % 65521;
            }
            return (b << 16) | a;
        }

        function encode(imgData, kind) {
            var width = imgData.width;
            var height = imgData.height;
            var bitDepth, colorType, lineSize;
            var bytes = imgData.data;

            switch (kind) {
                case ImageKind.GRAYSCALE_1BPP:
                    colorType = 0;
                    bitDepth = 1;
                    lineSize = (width + 7) >> 3;
                    break;
                case ImageKind.RGB_24BPP:
                    colorType = 2;
                    bitDepth = 8;
                    lineSize = width * 3;
                    break;
                case ImageKind.RGBA_32BPP:
                    colorType = 6;
                    bitDepth = 8;
                    lineSize = width * 4;
                    break;
                default:
                    throw new Error('invalid format');
            }

            // prefix every row with predictor 0
            var literals = new Uint8Array((1 + lineSize) * height);
            var offsetLiterals = 0, offsetBytes = 0;
            var y, i;
            for (y = 0; y < height; ++y) {
                literals[offsetLiterals++] = 0; // no prediction
                literals.set(bytes.subarray(offsetBytes, offsetBytes + lineSize),
                    offsetLiterals);
                offsetBytes += lineSize;
                offsetLiterals += lineSize;
            }

            if (kind === ImageKind.GRAYSCALE_1BPP) {
                // inverting for B/W
                offsetLiterals = 0;
                for (y = 0; y < height; y++) {
                    offsetLiterals++; // skipping predictor
                    for (i = 0; i < lineSize; i++) {
                        literals[offsetLiterals++] ^= 0xFF;
                    }
                }
            }

            var ihdr = new Uint8Array([
                width >> 24 & 0xff,
                width >> 16 & 0xff,
                width >> 8 & 0xff,
                width & 0xff,
                height >> 24 & 0xff,
                height >> 16 & 0xff,
                height >> 8 & 0xff,
                height & 0xff,
                bitDepth, // bit depth
                colorType, // color type
                0x00, // compression method
                0x00, // filter method
                0x00 // interlace method
            ]);

            var len = literals.length;
            var maxBlockLength = 0xFFFF;

            var deflateBlocks = Math.ceil(len / maxBlockLength);
            var idat = new Uint8Array(2 + len + deflateBlocks * 5 + 4);
            var pi = 0;
            idat[pi++] = 0x78; // compression method and flags
            idat[pi++] = 0x9c; // flags

            var pos = 0;
            while (len > maxBlockLength) {
                // writing non-final DEFLATE blocks type 0 and length of 65535
                idat[pi++] = 0x00;
                idat[pi++] = 0xff;
                idat[pi++] = 0xff;
                idat[pi++] = 0x00;
                idat[pi++] = 0x00;
                idat.set(literals.subarray(pos, pos + maxBlockLength), pi);
                pi += maxBlockLength;
                pos += maxBlockLength;
                len -= maxBlockLength;
            }

            // writing non-final DEFLATE blocks type 0
            idat[pi++] = 0x01;
            idat[pi++] = len & 0xff;
            idat[pi++] = len >> 8 & 0xff;
            idat[pi++] = (~len & 0xffff) & 0xff;
            idat[pi++] = (~len & 0xffff) >> 8 & 0xff;
            idat.set(literals.subarray(pos), pi);
            pi += literals.length - pos;

            var adler = adler32(literals, 0, literals.length); // checksum
            idat[pi++] = adler >> 24 & 0xff;
            idat[pi++] = adler >> 16 & 0xff;
            idat[pi++] = adler >> 8 & 0xff;
            idat[pi++] = adler & 0xff;

            // PNG will consists: header, IHDR+data, IDAT+data, and IEND.
            var pngLength = PNG_HEADER.length + (CHUNK_WRAPPER_SIZE * 3) +
                ihdr.length + idat.length;
            var data = new Uint8Array(pngLength);
            var offset = 0;
            data.set(PNG_HEADER, offset);
            offset += PNG_HEADER.length;
            writePngChunk('IHDR', ihdr, data, offset);
            offset += CHUNK_WRAPPER_SIZE + ihdr.length;
            writePngChunk('IDATA', idat, data, offset);
            offset += CHUNK_WRAPPER_SIZE + idat.length;
            writePngChunk('IEND', new Uint8Array(0), data, offset);

            return PDFJS.createObjectURL(data, 'image/png');
        }

        return function convertImgDataToPng(imgData) {
            var kind = (imgData.kind === undefined ?
                ImageKind.GRAYSCALE_1BPP : imgData.kind);
            return encode(imgData, kind);
        };
    })();

    var SVGExtraState = (function SVGExtraStateClosure() {
        function SVGExtraState() {
            this.fontSizeScale = 1;
            this.fontWeight = SVG_DEFAULTS.fontWeight;
            this.fontSize = 0;

            this.textMatrix = IDENTITY_MATRIX;
            this.fontMatrix = FONT_IDENTITY_MATRIX;
            this.leading = 0;

            // Current point (in user coordinates)
            this.x = 0;
            this.y = 0;

            // Start of text line (in text coordinates)
            this.lineX = 0;
            this.lineY = 0;

            // Character and word spacing
            this.charSpacing = 0;
            this.wordSpacing = 0;
            this.textHScale = 1;
            this.textRise = 0;

            // Default foreground and background colors
            this.fillColor = SVG_DEFAULTS.fillColor;
            this.strokeColor = '#000000';

            this.fillAlpha = 1;
            this.strokeAlpha = 1;
            this.lineWidth = 1;
            this.lineJoin = '';
            this.lineCap = '';
            this.miterLimit = 0;

            this.dashArray = [];
            this.dashPhase = 0;

            this.dependencies = [];

            // Clipping
            this.clipId = '';
            this.pendingClip = false;

            this.maskId = '';
        }

        SVGExtraState.prototype = {
            clone: function SVGExtraState_clone() {
                return Object.create(this);
            },
            setCurrentPoint: function SVGExtraState_setCurrentPoint(x, y) {
                this.x = x;
                this.y = y;
            }
        };
        return SVGExtraState;
    })();

    var SVGGraphics = (function SVGGraphicsClosure() {
        function createScratchSVG(width, height) {
            var NS = 'http://www.w3.org/2000/svg';
            var svg = document.createElementNS(NS, 'svg:svg');
            svg.setAttributeNS(null, 'version', '1.1');
            svg.setAttributeNS(null, 'width', width + 'px');
            svg.setAttributeNS(null, 'height', height + 'px');
            svg.setAttributeNS(null, 'viewBox', '0 0 ' + width + ' ' + height);
            return svg;
        }

        function opListToTree(opList) {
            var opTree = [];
            var tmp = [];
            var opListLen = opList.length;

            for (var x = 0; x < opListLen; x++) {
                if (opList[x].fn === 'save') {
                    opTree.push({'fnId': 92, 'fn': 'group', 'items': []});
                    tmp.push(opTree);
                    opTree = opTree[opTree.length - 1].items;
                    continue;
                }

                if(opList[x].fn === 'restore') {
                    opTree = tmp.pop();
                } else {
                    opTree.push(opList[x]);
                }
            }
            return opTree;
        }

        /**
         * Formats float number.
         * @param value {number} number to format.
         * @returns {string}
         */
        function pf(value) {
            if (value === (value | 0)) { // integer number
                return value.toString();
            }
            var s = value.toFixed(10);
            var i = s.length - 1;
            if (s[i] !== '0') {
                return s;
            }
            // removing trailing zeros
            do {
                i--;
            } while (s[i] === '0');
            return s.substr(0, s[i] === '.' ? i : i + 1);
        }

        /**
         * Formats transform matrix. The standard rotation, scale and translate
         * matrices are replaced by their shorter forms, and for identity matrix
         * returns empty string to save the memory.
         * @param m {Array} matrix to format.
         * @returns {string}
         */
        function pm(m) {
            if (m[4] === 0 && m[5] === 0) {
                if (m[1] === 0 && m[2] === 0) {
                    if (m[0] === 1 && m[3] === 1) {
                        return '';
                    }
                    return 'scale(' + pf(m[0]) + ' ' + pf(m[3]) + ')';
                }
                if (m[0] === m[3] && m[1] === -m[2]) {
                    var a = Math.acos(m[0]) * 180 / Math.PI;
                    return 'rotate(' + pf(a) + ')';
                }
            } else {
                if (m[0] === 1 && m[1] === 0 && m[2] === 0 && m[3] === 1) {
                    return 'translate(' + pf(m[4]) + ' ' + pf(m[5]) + ')';
                }
            }
            return 'matrix(' + pf(m[0]) + ' ' + pf(m[1]) + ' ' + pf(m[2]) + ' ' +
                pf(m[3]) + ' ' + pf(m[4]) + ' ' + pf(m[5]) + ')';
        }

        function SVGGraphics(commonObjs, objs) {
            this.current = new SVGExtraState();
            this.transformMatrix = IDENTITY_MATRIX; // Graphics state matrix
            this.transformStack = [];
            this.extraStack = [];
            this.commonObjs = commonObjs;
            this.objs = objs;
            this.pendingEOFill = false;

            this.embedFonts = false;
            this.embeddedFonts = {};
            this.cssStyle = null;
        }

        var NS = 'http://www.w3.org/2000/svg';
        var XML_NS = 'http://www.w3.org/XML/1998/namespace';
        var XLINK_NS = 'http://www.w3.org/1999/xlink';
        var LINE_CAP_STYLES = ['butt', 'round', 'square'];
        var LINE_JOIN_STYLES = ['miter', 'round', 'bevel'];
        var clipCount = 0;
        var maskCount = 0;

        SVGGraphics.prototype = {
            save: function SVGGraphics_save() {
                this.transformStack.push(this.transformMatrix);
                var old = this.current;
                this.extraStack.push(old);
                this.current = old.clone();
            },

            restore: function SVGGraphics_restore() {
                this.transformMatrix = this.transformStack.pop();
                this.current = this.extraStack.pop();

                this.tgrp = document.createElementNS(NS, 'svg:g');
                this.tgrp.setAttributeNS(null, 'transform', pm(this.transformMatrix));
                this.pgrp.appendChild(this.tgrp);
            },

            group: function SVGGraphics_group(items) {
                this.save();
                this.executeOpTree(items);
                this.restore();
            },

            loadDependencies: function SVGGraphics_loadDependencies(operatorList) {
                var fnArray = operatorList.fnArray;
                var fnArrayLen = fnArray.length;
                var argsArray = operatorList.argsArray;

                var self = this;
                for (var i = 0; i < fnArrayLen; i++) {
                    if (OPS.dependency === fnArray[i]) {
                        var deps = argsArray[i];
                        for (var n = 0, nn = deps.length; n < nn; n++) {
                            var obj = deps[n];
                            var common = obj.substring(0, 2) === 'g_';
                            var promise;
                            if (common) {
                                promise = new Promise(function(resolve) {
                                    self.commonObjs.get(obj, resolve);
                                });
                            } else {
                                promise = new Promise(function(resolve) {
                                    self.objs.get(obj, resolve);
                                });
                            }
                            this.current.dependencies.push(promise);
                        }
                    }
                }
                return Promise.all(this.current.dependencies);
            },

            transform: function SVGGraphics_transform(a, b, c, d, e, f) {
                var transformMatrix = [a, b, c, d, e, f];
                this.transformMatrix = PDFJS.Util.transform(this.transformMatrix,
                    transformMatrix);

                this.tgrp = document.createElementNS(NS, 'svg:g');
                this.tgrp.setAttributeNS(null, 'transform', pm(this.transformMatrix));
            },

            getSVG: function SVGGraphics_getSVG(operatorList, viewport) {
                this.svg = createScratchSVG(viewport.width, viewport.height);
                this.viewport = viewport;

                return this.loadDependencies(operatorList).then(function () {
                    this.transformMatrix = IDENTITY_MATRIX;
                    this.pgrp = document.createElementNS(NS, 'svg:g'); // Parent group
                    this.pgrp.setAttributeNS(null, 'transform', pm(viewport.transform));
                    this.tgrp = document.createElementNS(NS, 'svg:g'); // Transform group
                    this.tgrp.setAttributeNS(null, 'transform', pm(this.transformMatrix));
                    this.defs = document.createElementNS(NS, 'svg:defs');
                    this.pgrp.appendChild(this.defs);
                    this.pgrp.appendChild(this.tgrp);
                    this.svg.appendChild(this.pgrp);
                    var opTree = this.convertOpList(operatorList);
                    this.executeOpTree(opTree);
                    return this.svg;
                }.bind(this));
            },

            convertOpList: function SVGGraphics_convertOpList(operatorList) {
                var argsArray = operatorList.argsArray;
                var fnArray = operatorList.fnArray;
                var fnArrayLen  = fnArray.length;
                var REVOPS = [];
                var opList = [];

                for (var op in OPS) {
                    REVOPS[OPS[op]] = op;
                }

                for (var x = 0; x < fnArrayLen; x++) {
                    var fnId = fnArray[x];
                    opList.push({'fnId' : fnId, 'fn': REVOPS[fnId], 'args': argsArray[x]});
                }
                return opListToTree(opList);
            },

            executeOpTree: function SVGGraphics_executeOpTree(opTree) {
                var opTreeLen = opTree.length;
                for(var x = 0; x < opTreeLen; x++) {
                    var fn = opTree[x].fn;
                    var fnId = opTree[x].fnId;
                    var args = opTree[x].args;

                    switch (fnId | 0) {
                        case OPS.beginText:
                            this.beginText();
                            break;
                        case OPS.setLeading:
                            this.setLeading(args);
                            break;
                        case OPS.setLeadingMoveText:
                            this.setLeadingMoveText(args[0], args[1]);
                            break;
                        case OPS.setFont:
                            this.setFont(args);
                            break;
                        case OPS.showText:
                            this.showText(args[0]);
                            break;
                        case OPS.showSpacedText:
                            this.showText(args[0]);
                            break;
                        case OPS.endText:
                            this.endText();
                            break;
                        case OPS.moveText:
                            this.moveText(args[0], args[1]);
                            break;
                        case OPS.setCharSpacing:
                            this.setCharSpacing(args[0]);
                            break;
                        case OPS.setWordSpacing:
                            this.setWordSpacing(args[0]);
                            break;
                        case OPS.setHScale:
                            this.setHScale(args[0]);
                            break;
                        case OPS.setTextMatrix:
                            this.setTextMatrix(args[0], args[1], args[2],
                                args[3], args[4], args[5]);
                            break;
                        case OPS.setLineWidth:
                            this.setLineWidth(args[0]);
                            break;
                        case OPS.setLineJoin:
                            this.setLineJoin(args[0]);
                            break;
                        case OPS.setLineCap:
                            this.setLineCap(args[0]);
                            break;
                        case OPS.setMiterLimit:
                            this.setMiterLimit(args[0]);
                            break;
                        case OPS.setFillRGBColor:
                            this.setFillRGBColor(args[0], args[1], args[2]);
                            break;
                        case OPS.setStrokeRGBColor:
                            this.setStrokeRGBColor(args[0], args[1], args[2]);
                            break;
                        case OPS.setDash:
                            this.setDash(args[0], args[1]);
                            break;
                        case OPS.setGState:
                            this.setGState(args[0]);
                            break;
                        case OPS.fill:
                            this.fill();
                            break;
                        case OPS.eoFill:
                            this.eoFill();
                            break;
                        case OPS.stroke:
                            this.stroke();
                            break;
                        case OPS.fillStroke:
                            this.fillStroke();
                            break;
                        case OPS.eoFillStroke:
                            this.eoFillStroke();
                            break;
                        case OPS.clip:
                            this.clip('nonzero');
                            break;
                        case OPS.eoClip:
                            this.clip('evenodd');
                            break;
                        case OPS.paintSolidColorImageMask:
                            this.paintSolidColorImageMask();
                            break;
                        case OPS.paintJpegXObject:
                            this.paintJpegXObject(args[0], args[1], args[2]);
                            break;
                        case OPS.paintImageXObject:
                            this.paintImageXObject(args[0]);
                            break;
                        case OPS.paintInlineImageXObject:
                            this.paintInlineImageXObject(args[0]);
                            break;
                        case OPS.paintImageMaskXObject:
                            this.paintImageMaskXObject(args[0]);
                            break;
                        case OPS.paintFormXObjectBegin:
                            this.paintFormXObjectBegin(args[0], args[1]);
                            break;
                        case OPS.paintFormXObjectEnd:
                            this.paintFormXObjectEnd();
                            break;
                        case OPS.closePath:
                            this.closePath();
                            break;
                        case OPS.closeStroke:
                            this.closeStroke();
                            break;
                        case OPS.closeFillStroke:
                            this.closeFillStroke();
                            break;
                        case OPS.nextLine:
                            this.nextLine();
                            break;
                        case OPS.transform:
                            this.transform(args[0], args[1], args[2], args[3],
                                args[4], args[5]);
                            break;
                        case OPS.constructPath:
                            this.constructPath(args[0], args[1]);
                            break;
                        case OPS.endPath:
                            this.endPath();
                            break;
                        case 92:
                            this.group(opTree[x].items);
                            break;
                        default:
                            warn('Unimplemented method '+ fn);
                            break;
                    }
                }
            },

            setWordSpacing: function SVGGraphics_setWordSpacing(wordSpacing) {
                this.current.wordSpacing = wordSpacing;
            },

            setCharSpacing: function SVGGraphics_setCharSpacing(charSpacing) {
                this.current.charSpacing = charSpacing;
            },

            nextLine: function SVGGraphics_nextLine() {
                this.moveText(0, this.current.leading);
            },

            setTextMatrix: function SVGGraphics_setTextMatrix(a, b, c, d, e, f) {
                var current = this.current;
                this.current.textMatrix = this.current.lineMatrix = [a, b, c, d, e, f];

                this.current.x = this.current.lineX = 0;
                this.current.y = this.current.lineY = 0;

                current.xcoords = [];
                current.tspan = document.createElementNS(NS, 'svg:tspan');
                current.tspan.setAttributeNS(null, 'font-family', current.fontFamily);
                current.tspan.setAttributeNS(null, 'font-size',
                    pf(current.fontSize) + 'px');
                current.tspan.setAttributeNS(null, 'y', pf(-current.y));

                current.txtElement = document.createElementNS(NS, 'svg:text');
                current.txtElement.appendChild(current.tspan);
            },

            beginText: function SVGGraphics_beginText() {
                this.current.x = this.current.lineX = 0;
                this.current.y = this.current.lineY = 0;
                this.current.textMatrix = IDENTITY_MATRIX;
                this.current.lineMatrix = IDENTITY_MATRIX;
                this.current.tspan = document.createElementNS(NS, 'svg:tspan');
                this.current.txtElement = document.createElementNS(NS, 'svg:text');
                this.current.txtgrp = document.createElementNS(NS, 'svg:g');
                this.current.xcoords = [];
            },

            moveText: function SVGGraphics_moveText(x, y) {
                var current = this.current;
                this.current.x = this.current.lineX += x;
                this.current.y = this.current.lineY += y;

                current.xcoords = [];
                current.tspan = document.createElementNS(NS, 'svg:tspan');
                current.tspan.setAttributeNS(null, 'font-family', current.fontFamily);
                current.tspan.setAttributeNS(null, 'font-size',
                    pf(current.fontSize) + 'px');
                current.tspan.setAttributeNS(null, 'y', pf(-current.y));
            },

            showText: function SVGGraphics_showText(glyphs) {
                var current = this.current;
                var font = current.font;
                var fontSize = current.fontSize;

                if (fontSize === 0) {
                    return;
                }

                var charSpacing = current.charSpacing;
                var wordSpacing = current.wordSpacing;
                var fontDirection = current.fontDirection;
                var textHScale = current.textHScale * fontDirection;
                var glyphsLength = glyphs.length;
                var vertical = font.vertical;
                var widthAdvanceScale = fontSize * current.fontMatrix[0];

                var x = 0, i;
                for (i = 0; i < glyphsLength; ++i) {
                    var glyph = glyphs[i];
                    if (glyph === null) {
                        // word break
                        x += fontDirection * wordSpacing;
                        continue;
                    } else if (isNum(glyph)) {
                        x += -glyph * fontSize * 0.001;
                        continue;
                    }
                    current.xcoords.push(current.x + x * textHScale);

                    var width = glyph.width;
                    var character = glyph.fontChar;
                    var charWidth = width * widthAdvanceScale + charSpacing * fontDirection;
                    x += charWidth;

                    current.tspan.textContent += character;
                }
                if (vertical) {
                    current.y -= x * textHScale;
                } else {
                    current.x += x * textHScale;
                }

                current.tspan.setAttributeNS(null, 'x',
                    current.xcoords.map(pf).join(' '));
                current.tspan.setAttributeNS(null, 'y', pf(-current.y));
                current.tspan.setAttributeNS(null, 'font-family', current.fontFamily);
                current.tspan.setAttributeNS(null, 'font-size',
                    pf(current.fontSize) + 'px');
                if (current.fontStyle !== SVG_DEFAULTS.fontStyle) {
                    current.tspan.setAttributeNS(null, 'font-style', current.fontStyle);
                }
                if (current.fontWeight !== SVG_DEFAULTS.fontWeight) {
                    current.tspan.setAttributeNS(null, 'font-weight', current.fontWeight);
                }
                if (current.fillColor !== SVG_DEFAULTS.fillColor) {
                    current.tspan.setAttributeNS(null, 'fill', current.fillColor);
                }

                current.txtElement.setAttributeNS(null, 'transform',
                    pm(current.textMatrix) +
                    ' scale(1, -1)' );
                current.txtElement.setAttributeNS(XML_NS, 'xml:space', 'preserve');
                current.txtElement.appendChild(current.tspan);
                current.txtgrp.appendChild(current.txtElement);

                this.tgrp.appendChild(current.txtElement);

            },

            setLeadingMoveText: function SVGGraphics_setLeadingMoveText(x, y) {
                this.setLeading(-y);
                this.moveText(x, y);
            },

            addFontStyle: function SVGGraphics_addFontStyle(fontObj) {
                if (!this.cssStyle) {
                    this.cssStyle = document.createElementNS(NS, 'svg:style');
                    this.cssStyle.setAttributeNS(null, 'type', 'text/css');
                    this.defs.appendChild(this.cssStyle);
                }

                var url = PDFJS.createObjectURL(fontObj.data, fontObj.mimetype);
                this.cssStyle.textContent +=
                    '@font-face { font-family: "' + fontObj.loadedName + '";' +
                    ' src: url(' + url + '); }\n';
            },

            setFont: function SVGGraphics_setFont(details) {
                var current = this.current;
                var fontObj = this.commonObjs.get(details[0]);
                var size = details[1];
                this.current.font = fontObj;

                if (this.embedFonts && fontObj.data &&
                    !this.embeddedFonts[fontObj.loadedName]) {
                    this.addFontStyle(fontObj);
                    this.embeddedFonts[fontObj.loadedName] = fontObj;
                }

                current.fontMatrix = (fontObj.fontMatrix ?
                    fontObj.fontMatrix : FONT_IDENTITY_MATRIX);

                var bold = fontObj.black ? (fontObj.bold ? 'bolder' : 'bold') :
                    (fontObj.bold ? 'bold' : 'normal');
                var italic = fontObj.italic ? 'italic' : 'normal';

                if (size < 0) {
                    size = -size;
                    current.fontDirection = -1;
                } else {
                    current.fontDirection = 1;
                }
                current.fontSize = size;
                current.fontFamily = fontObj.loadedName;
                current.fontWeight = bold;
                current.fontStyle = italic;

                current.tspan = document.createElementNS(NS, 'svg:tspan');
                current.tspan.setAttributeNS(null, 'y', pf(-current.y));
                current.xcoords = [];
            },

            endText: function SVGGraphics_endText() {
                if (this.current.pendingClip) {
                    this.cgrp.appendChild(this.tgrp);
                    this.pgrp.appendChild(this.cgrp);
                } else {
                    this.pgrp.appendChild(this.tgrp);
                }
                this.tgrp = document.createElementNS(NS, 'svg:g');
                this.tgrp.setAttributeNS(null, 'transform', pm(this.transformMatrix));
            },

            // Path properties
            setLineWidth: function SVGGraphics_setLineWidth(width) {
                this.current.lineWidth = width;
            },
            setLineCap: function SVGGraphics_setLineCap(style) {
                this.current.lineCap = LINE_CAP_STYLES[style];
            },
            setLineJoin: function SVGGraphics_setLineJoin(style) {
                this.current.lineJoin = LINE_JOIN_STYLES[style];
            },
            setMiterLimit: function SVGGraphics_setMiterLimit(limit) {
                this.current.miterLimit = limit;
            },
            setStrokeRGBColor: function SVGGraphics_setStrokeRGBColor(r, g, b) {
                var color = Util.makeCssRgb(r, g, b);
                this.current.strokeColor = color;
            },
            setFillRGBColor: function SVGGraphics_setFillRGBColor(r, g, b) {
                var color = Util.makeCssRgb(r, g, b);
                this.current.fillColor = color;
                this.current.tspan = document.createElementNS(NS, 'svg:tspan');
                this.current.xcoords = [];
            },
            setDash: function SVGGraphics_setDash(dashArray, dashPhase) {
                this.current.dashArray = dashArray;
                this.current.dashPhase = dashPhase;
            },

            constructPath: function SVGGraphics_constructPath(ops, args) {
                var current = this.current;
                var x = current.x, y = current.y;
                current.path = document.createElementNS(NS, 'svg:path');
                var d = [];
                var opLength = ops.length;

                for (var i = 0, j = 0; i < opLength; i++) {
                    switch (ops[i] | 0) {
                        case OPS.rectangle:
                            x = args[j++];
                            y = args[j++];
                            var width = args[j++];
                            var height = args[j++];
                            var xw = x + width;
                            var yh = y + height;
                            d.push('M', pf(x), pf(y), 'L', pf(xw) , pf(y), 'L', pf(xw), pf(yh),
                                'L', pf(x), pf(yh), 'Z');
                            break;
                        case OPS.moveTo:
                            x = args[j++];
                            y = args[j++];
                            d.push('M', pf(x), pf(y));
                            break;
                        case OPS.lineTo:
                            x = args[j++];
                            y = args[j++];
                            d.push('L', pf(x) , pf(y));
                            break;
                        case OPS.curveTo:
                            x = args[j + 4];
                            y = args[j + 5];
                            d.push('C', pf(args[j]), pf(args[j + 1]), pf(args[j + 2]),
                                pf(args[j + 3]), pf(x), pf(y));
                            j += 6;
                            break;
                        case OPS.curveTo2:
                            x = args[j + 2];
                            y = args[j + 3];
                            d.push('C', pf(x), pf(y), pf(args[j]), pf(args[j + 1]),
                                pf(args[j + 2]), pf(args[j + 3]));
                            j += 4;
                            break;
                        case OPS.curveTo3:
                            x = args[j + 2];
                            y = args[j + 3];
                            d.push('C', pf(args[j]), pf(args[j + 1]), pf(x), pf(y),
                                pf(x), pf(y));
                            j += 4;
                            break;
                        case OPS.closePath:
                            d.push('Z');
                            break;
                    }
                }
                current.path.setAttributeNS(null, 'd', d.join(' '));
                current.path.setAttributeNS(null, 'stroke-miterlimit',
                    pf(current.miterLimit));
                current.path.setAttributeNS(null, 'stroke-linecap', current.lineCap);
                current.path.setAttributeNS(null, 'stroke-linejoin', current.lineJoin);
                current.path.setAttributeNS(null, 'stroke-width',
                    pf(current.lineWidth) + 'px');
                current.path.setAttributeNS(null, 'stroke-dasharray',
                    current.dashArray.map(pf).join(' '));
                current.path.setAttributeNS(null, 'stroke-dashoffset',
                    pf(current.dashPhase) + 'px');
                current.path.setAttributeNS(null, 'fill', 'none');

                this.tgrp.appendChild(current.path);
                if (current.pendingClip) {
                    this.cgrp.appendChild(this.tgrp);
                    this.pgrp.appendChild(this.cgrp);
                } else {
                    this.pgrp.appendChild(this.tgrp);
                }
                // Saving a reference in current.element so that it can be addressed
                // in 'fill' and 'stroke'
                current.element = current.path;
                current.setCurrentPoint(x, y);
            },

            endPath: function SVGGraphics_endPath() {
                var current = this.current;
                if (current.pendingClip) {
                    this.cgrp.appendChild(this.tgrp);
                    this.pgrp.appendChild(this.cgrp);
                } else {
                    this.pgrp.appendChild(this.tgrp);
                }
                this.tgrp = document.createElementNS(NS, 'svg:g');
                this.tgrp.setAttributeNS(null, 'transform', pm(this.transformMatrix));
            },

            clip: function SVGGraphics_clip(type) {
                var current = this.current;
                // Add current path to clipping path
                current.clipId = 'clippath' + clipCount;
                clipCount++;
                this.clippath = document.createElementNS(NS, 'svg:clipPath');
                this.clippath.setAttributeNS(null, 'id', current.clipId);
                var clipElement = current.element.cloneNode();
                if (type === 'evenodd') {
                    clipElement.setAttributeNS(null, 'clip-rule', 'evenodd');
                } else {
                    clipElement.setAttributeNS(null, 'clip-rule', 'nonzero');
                }
                this.clippath.setAttributeNS(null, 'transform', pm(this.transformMatrix));
                this.clippath.appendChild(clipElement);
                this.defs.appendChild(this.clippath);

                // Create a new group with that attribute
                current.pendingClip = true;
                this.cgrp = document.createElementNS(NS, 'svg:g');
                this.cgrp.setAttributeNS(null, 'clip-path',
                    'url(#' + current.clipId + ')');
                this.pgrp.appendChild(this.cgrp);
            },

            closePath: function SVGGraphics_closePath() {
                var current = this.current;
                var d = current.path.getAttributeNS(null, 'd');
                d += 'Z';
                current.path.setAttributeNS(null, 'd', d);
            },

            setLeading: function SVGGraphics_setLeading(leading) {
                this.current.leading = -leading;
            },

            setTextRise: function SVGGraphics_setTextRise(textRise) {
                this.current.textRise = textRise;
            },

            setHScale: function SVGGraphics_setHScale(scale) {
                this.current.textHScale = scale / 100;
            },

            setGState: function SVGGraphics_setGState(states) {
                for (var i = 0, ii = states.length; i < ii; i++) {
                    var state = states[i];
                    var key = state[0];
                    var value = state[1];

                    switch (key) {
                        case 'LW':
                            this.setLineWidth(value);
                            break;
                        case 'LC':
                            this.setLineCap(value);
                            break;
                        case 'LJ':
                            this.setLineJoin(value);
                            break;
                        case 'ML':
                            this.setMiterLimit(value);
                            break;
                        case 'D':
                            this.setDash(value[0], value[1]);
                            break;
                        case 'RI':
                            break;
                        case 'FL':
                            break;
                        case 'Font':
                            this.setFont(value);
                            break;
                        case 'CA':
                            break;
                        case 'ca':
                            break;
                        case 'BM':
                            break;
                        case 'SMask':
                            break;
                    }
                }
            },

            fill: function SVGGraphics_fill() {
                var current = this.current;
                current.element.setAttributeNS(null, 'fill', current.fillColor);
            },

            stroke: function SVGGraphics_stroke() {
                var current = this.current;
                current.element.setAttributeNS(null, 'stroke', current.strokeColor);
                current.element.setAttributeNS(null, 'fill', 'none');
            },

            eoFill: function SVGGraphics_eoFill() {
                var current = this.current;
                current.element.setAttributeNS(null, 'fill', current.fillColor);
                current.element.setAttributeNS(null, 'fill-rule', 'evenodd');
            },

            fillStroke: function SVGGraphics_fillStroke() {
                // Order is important since stroke wants fill to be none.
                // First stroke, then if fill needed, it will be overwritten.
                this.stroke();
                this.fill();
            },

            eoFillStroke: function SVGGraphics_eoFillStroke() {
                this.current.element.setAttributeNS(null, 'fill-rule', 'evenodd');
                this.fillStroke();
            },

            closeStroke: function SVGGraphics_closeStroke() {
                this.closePath();
                this.stroke();
            },

            closeFillStroke: function SVGGraphics_closeFillStroke() {
                this.closePath();
                this.fillStroke();
            },

            paintSolidColorImageMask:
                function SVGGraphics_paintSolidColorImageMask() {
                    var current = this.current;
                    var rect = document.createElementNS(NS, 'svg:rect');
                    rect.setAttributeNS(null, 'x', '0');
                    rect.setAttributeNS(null, 'y', '0');
                    rect.setAttributeNS(null, 'width', '1px');
                    rect.setAttributeNS(null, 'height', '1px');
                    rect.setAttributeNS(null, 'fill', current.fillColor);
                    this.tgrp.appendChild(rect);
                },

            paintJpegXObject: function SVGGraphics_paintJpegXObject(objId, w, h) {
                var current = this.current;
                var imgObj = this.objs.get(objId);
                var imgEl = document.createElementNS(NS, 'svg:image');
                imgEl.setAttributeNS(XLINK_NS, 'xlink:href', imgObj.src);
                imgEl.setAttributeNS(null, 'width', imgObj.width + 'px');
                imgEl.setAttributeNS(null, 'height', imgObj.height + 'px');
                imgEl.setAttributeNS(null, 'x', '0');
                imgEl.setAttributeNS(null, 'y', pf(-h));
                imgEl.setAttributeNS(null, 'transform',
                    'scale(' + pf(1 / w) + ' ' + pf(-1 / h) + ')');

                this.tgrp.appendChild(imgEl);
                if (current.pendingClip) {
                    this.cgrp.appendChild(this.tgrp);
                    this.pgrp.appendChild(this.cgrp);
                } else {
                    this.pgrp.appendChild(this.tgrp);
                }
            },

            paintImageXObject: function SVGGraphics_paintImageXObject(objId) {
                var imgData = this.objs.get(objId);
                if (!imgData) {
                    warn('Dependent image isn\'t ready yet');
                    return;
                }
                this.paintInlineImageXObject(imgData);
            },

            paintInlineImageXObject:
                function SVGGraphics_paintInlineImageXObject(imgData, mask) {
                    var current = this.current;
                    var width = imgData.width;
                    var height = imgData.height;

                    var imgSrc = convertImgDataToPng(imgData);
                    var cliprect = document.createElementNS(NS, 'svg:rect');
                    cliprect.setAttributeNS(null, 'x', '0');
                    cliprect.setAttributeNS(null, 'y', '0');
                    cliprect.setAttributeNS(null, 'width', pf(width));
                    cliprect.setAttributeNS(null, 'height', pf(height));
                    current.element = cliprect;
                    this.clip('nonzero');
                    var imgEl = document.createElementNS(NS, 'svg:image');
                    imgEl.setAttributeNS(XLINK_NS, 'xlink:href', imgSrc);
                    imgEl.setAttributeNS(null, 'x', '0');
                    imgEl.setAttributeNS(null, 'y', pf(-height));
                    imgEl.setAttributeNS(null, 'width', pf(width) + 'px');
                    imgEl.setAttributeNS(null, 'height', pf(height) + 'px');
                    imgEl.setAttributeNS(null, 'transform',
                        'scale(' + pf(1 / width) + ' ' +
                        pf(-1 / height) + ')');
                    if (mask) {
                        mask.appendChild(imgEl);
                    } else {
                        this.tgrp.appendChild(imgEl);
                    }
                    if (current.pendingClip) {
                        this.cgrp.appendChild(this.tgrp);
                        this.pgrp.appendChild(this.cgrp);
                    } else {
                        this.pgrp.appendChild(this.tgrp);
                    }
                },

            paintImageMaskXObject:
                function SVGGraphics_paintImageMaskXObject(imgData) {
                    var current = this.current;
                    var width = imgData.width;
                    var height = imgData.height;
                    var fillColor = current.fillColor;

                    current.maskId = 'mask' + maskCount++;
                    var mask = document.createElementNS(NS, 'svg:mask');
                    mask.setAttributeNS(null, 'id', current.maskId);

                    var rect = document.createElementNS(NS, 'svg:rect');
                    rect.setAttributeNS(null, 'x', '0');
                    rect.setAttributeNS(null, 'y', '0');
                    rect.setAttributeNS(null, 'width', pf(width));
                    rect.setAttributeNS(null, 'height', pf(height));
                    rect.setAttributeNS(null, 'fill', fillColor);
                    rect.setAttributeNS(null, 'mask', 'url(#' + current.maskId +')');
                    this.defs.appendChild(mask);
                    this.tgrp.appendChild(rect);

                    this.paintInlineImageXObject(imgData, mask);
                },

            paintFormXObjectBegin:
                function SVGGraphics_paintFormXObjectBegin(matrix, bbox) {
                    this.save();

                    if (isArray(matrix) && matrix.length === 6) {
                        this.transform(matrix[0], matrix[1], matrix[2],
                            matrix[3], matrix[4], matrix[5]);
                    }

                    if (isArray(bbox) && bbox.length === 4) {
                        var width = bbox[2] - bbox[0];
                        var height = bbox[3] - bbox[1];

                        var cliprect = document.createElementNS(NS, 'svg:rect');
                        cliprect.setAttributeNS(null, 'x', bbox[0]);
                        cliprect.setAttributeNS(null, 'y', bbox[1]);
                        cliprect.setAttributeNS(null, 'width', pf(width));
                        cliprect.setAttributeNS(null, 'height', pf(height));
                        this.current.element = cliprect;
                        this.clip('nonzero');
                        this.endPath();
                    }
                },

            paintFormXObjectEnd:
                function SVGGraphics_paintFormXObjectEnd() {
                    this.restore();
                }
        };
        return SVGGraphics;
    })();

    PDFJS.SVGGraphics = SVGGraphics;


}).call((typeof window === 'undefined') ? this : window);

if (!PDFJS.workerSrc && typeof document !== 'undefined') {
    // workerSrc is not set -- using last script url to define default location
    PDFJS.workerSrc = (function () {
        'use strict';
        var scriptTagContainer = document.body ||
            document.getElementsByTagName('head')[0];
        var pdfjsSrc = scriptTagContainer.lastChild.src;
        return pdfjsSrc && pdfjsSrc.replace(/\.js$/i, '.worker.js');
    })();
}


